Warning: This article contains spoilers forCobra Kaiseason 4.

ENTERTAINMENT WEEKLY: How did you find out that Hawk was going to win the boys' tournament?

JACOB BERTRAND:No one knew for a really long time.

Cobra Kai Season 4

Jacob Bertrand on ‘Cobra Kai’.CURTIS BONDS BAKER/NETFLIX

And they told me, “Hey, we’re not doing this for nothing.

You’re gonna be an All Valley champ.”

I just think he was very impressionable at that point and was just very easily influenced.

Let’s discuss the mohawk.

Was it your real hair?

It is my hair!

Actually, season 4 was the only season that it wasn’t all my hair.

In season 4 I had an extension in.

I had black roots and my hair was dyed red, and then I had a little extension in.

How long did it take to get spiked up when it was time to shoot?

For the finale, was it strange fighting without the mohawk?

Did it affect your center of gravity or anything?

What’s funny is I genuinely did feel a difference when I would fight.

And I also felt like I’d lost a little bit of confidence.

This is a bummer."

How do you think that ultimately factored into his victory?

I think that gave him the confidence he needed.

He sort of reverted back to that Eli mentality of “I’m not enough.

Everyone’s making fun of me.”

Just everything you tell yourself when you’re a kid getting bullied.

And he’s like, “I’m gonna win this whole f—ing thing!”

What’s it been like to see the fan reaction to Hawk’s win?

It’s pretty cool.

I think I’ve gotten two so far two of the four have been mine.

I guess I have the edgiest, coolest character.

Like, right into Daniel LaRusso’s face.

They made the right choice going with the F-bomb take.

They’re like, “You know what?

He’s just so cool.

Like we just, we just can’t take this away!”

That’s what I heard all of the editors say, at least.

[Laughs]

Eli and Moon’s kiss happens in front of a big crowd.

What was that like to film?

Yeah, there actually was a pretty large crowd.

I’m not a pro yet.

What was your reaction when you first learned about theshirtless showdown?

I first heard about it when Tanner told me.

And I was like, “No we’re not.

You’re lying.”

And he’s like, “No, dude, I’m serious!

We’re gonna be shirtless and we’re gonna be fighting.”

And I was like, “Dude, no way.

Why would we take our shirts off?

That makes no sense.”

Then I asked the big three and they’re like, “Yeah, we’re debating it.”

Finally, the writers were like, “You guys are gonna take your shirts off.”

I almost broke a toe.

The writers came up to me and they were like, “Do that!

That’s badass.”

And I was like, “I literally did this as a joke.

I don’t think this is gonna work.”

And they’re like, “No, do it, do it, do it!”

It’ll look sick if the camera’s right on your back!"

And I was like, “Oh, that’s a good idea!”

I only did that in one take.

The show has wrapped production on season 5, though Netflix hasn’t announced when those episodes will drop.

How do you handle it when fans take a stab at get spoilers out of you?

Usually I just punch them in the face and say, “There you go.

That’s your spoiler.

There’s lots of fighting.”

[Laughs] Usually it’s like, “Oh, I can’t tell you that.

Netflix is gonna hit me with a big stick if I tell you anything.”

I honestly usually just say that, or I just say that I die.

Those are the three options.

There’s a lot of unlikely team-ups.

Season 5 was a good experience.

It was very fun getting to film with everyone.

That’s something that’s different about season 5, getting to be in scenes with almost everybody.