George loves watching Helmet Teens. It is a show about a group of four teenagers that each have a special power when they wear a space-helmet. Each helmet has their own own unique symbol, activating its own special ability to the person wearing it — and it only works for the teens! Their names are:

• Ethan;
• Walter;
• Fred; and
• Aris.

Unfortunately, the television was playing up; during the past week, the volume was randomly turning off and no sound would play, or the channel would randomly switch off, or the entire TV would do just that.

One day, during an episode of Helmet Teens, the TV screen turned black — but the sound kept playing! George was trying to figure out what episode it was, until he realised it was Episode 1.

This is what he heard:

"Greetings, humans. I am the Helmet Space Robot, home to a world of helmets. Much as you are humans, my kind living on my home planet are Helmets. Our planet is called Helm, and now I need you to help me. Listen carefully, as I will not repeat one word I say:

Our world has been destroyed by war, with the powers of the helmets battling each other. Now, I am the last Helmetkind alive. My home planet existed in the past, but not anymore!

As a consequence, for each of you, I have the four main helmets with the forces that used to govern our planet, so we can be remembered. Put these on, and you shall have powers beyond human strength."

This was the Helmet Space Robot, of course. Then spoke the four teens. George was waiting to hear their voices, but then the sound cut out and the subtitles appeared on the screen.

"Mother nature! This helmet is so down to me!"
"Cool! Everything else seems like me under the bridge!"
"Holy flame! I am so up myself, right now!"
"Knock me off my feet! I'm walking on myself!"

Somehow, George was able to tell which teen was telling which line, and which teen was receiving which helmet. (He was just beginning to actually enjoy the show, to his surprise, when suddenly the TV blew up and he had to tell his parents to get a new one.)

How did he do it?
What was the helmet each teenager was given?
What was each of their special abilities?

Bonus 50 rep bounty reward if (and only if!) you have answered the three previous questions:
What is the secret message hidden in Helmet Teens$${}$$?

The title seems unrelated... but it is a clue.

Edit:
Forgot to mention, this puzzle was inspired by @Keelhaul's "Unwelcome" puzzle. If you liked this puzzle, I suggest you check the other puzzle out if you think you haven't seen it.

• How could he solve a puzzle while listening to tv? :P Aug 22 '18 at 13:04
• As usual, @user477343 makes another spectacular puzzle :) Aug 22 '18 at 13:05
• @KevinL thank you! But I wouldn't classify this as a riddle... though if it is considered one, I will include the riddle tag :D Aug 22 '18 at 13:06
• Oops, I was so amazed that I didn't realize this wasn't a riddle :) Aug 22 '18 at 13:07
• @KevinL Uscfus wg am fsoz boas, pm hvs kom :D Aug 22 '18 at 13:14

So, the first thing I got was that

Helmet Teens is an anagram for "the elements".

Further, just like the

pairs of bolded Space Robot's words are different by only one letter, the four names are different from the names of the elements by only one letter: earth (Ethan), water (Walter), fire (Fred) and air (Aris).

If we

replace the word "me" in what the four "teens" are saying, we get: "Mother nature! This helmet is so down to Earth!" [Ethan] "Cool! Everything else seems like water under the bridge!" [Walter] "Holy flame! I am so fired up, right now!" [Fred] "Knock me off my feet! I'm walking on air!" [Aris]

So now we know who got which helmet.

• Wow. You are literally a wizard. I have to wait $12$ hours before I can upvote, as I have reached my daily voting limit. But that's not even the best part. There are two other things you will be getting, too. Since you are a puzzler, yourself, I am sure you know what they might be... However, there is only one other thing: what is the clue in the title? (It can be found in the explanation of your answer!) :D Aug 22 '18 at 11:29
• @user477343 Thaaaaanks! :D I love puzzles like these :) I still haven't figured it out though, but I'm pretty sure it has something to do with (rot13) gubfr svefg jbeq cnvef and how they are formed. Aug 22 '18 at 11:57
• No, not quite. Hint: (ROT13) gur "urnq" cneg ersref gb fbzrguvat boivbhf, ohg gur cuenfr "jenc lbhe urnq" vf bs pbhefr zrgncubevpny; v.r., vg vf na vqvbz... :P Aug 22 '18 at 12:03
• I would be careful about what you say about those names, the first example does not fit the rule you came up with Aug 23 '18 at 2:52
• @micsthepick Well actually, (ROT13) gurer ner gjb ehyrf: bar jurer lbh ercynpr n yrggre jvgu nabgure, naq bar jurer lbh gnxr njnl n yrggre :P Aug 23 '18 at 12:08