All right, here's the thing about the Todoroki fire-users.
Most forms of glass melt at a temperature of 1,400°C to 1,600° C.
Orange flames have a range of 1100°C to 1200°C.
So unless either of them can exceed the 1400°C threshold and get into the white flame range (1300°C - 1500°C), Shouto and Endeavor cannot melt glass.
But with a blue flame that burns 1,400°C-1,600°C, this bitch sure can.
So now that in the Ambush Simulation AU I've revealed Nine and his entourage are the LoV, imagine the opening scene of Heroes Rising:
Whichever henchmen they've hired to transport the cargo in that car chase scene are careening down the highway, the Pros are in pursuit...and so's the Vanguard.
Car accidents caused by the fleeing villains have put Rock Lock and company out of commission, but Shimura's motorcycle can maneuver through just fine, so he and his passenger are still in the game like it's a Greek chariot race. Nobody really knew the Vanguard was going to make an appearance, nobody knows how they got the info on what was happening, but hey, they're provisionally licensed and can operate under Pros now, so no one's going to complain about the extra manpower on their side.
So my thoughts and prayers are with the poor driver of the armored vehicle whose sole job is to focus on the road. He just wants to survive the night without getting arrested, his comrades can worry about the Pros behind them, he's more concerned about the Pros blockading the road in front of them, one of whom is Endeavor. He's not paying attention to that loud thunk he heard on the roof.
Things are already looking a little sticky...
...and then this crazy bastard appears in the windshield and starts melting the glass. Not breaking it; it's too thick to break without a weapon. Just slowly melting it so the poor guy has enough time to contemplate and regret some key life choices.
(There's a very specific image in my head here and it's the drowned corpse scene from the anime Ghost Hunt if anyone's familiar with that one.)
Anyway, the getaway driver just panics and veers over the guardrail and down the mountainside as it goes in the film, which pretty much leaves Shimura to stop his bike and stare alongside Endeavor down at the path of destroyed vegetation in horror as the sound of screeching metal fades to silence.
Shimura: ....
Endeavor: .... *slowly turns to look at Shimura*
Shimura: *doesn't look up* Hey, don't look at me. You created that monster.
...
And recall that scene ends with Endeavor heading down the hill to investigate the crash and finds Hawks already there:
Touya: What's the situation with my leg? It feels like it's either been broken or impaled.
Hawks: Actually, it's both. That's an...impressive compound fracture.
Touya: All that and I only got a busted leg? *sits up* Oh, no wait, fuck, there's two of you and Endeavor's multiplying.
Endeavor: *fed up* ....scared me to death, you shit for brains. Where's the League?
Hawks: I think they managed to warp out at the last minute. Genius here is the only body I found breathing or otherwise.
Touya: *cackling* Shut the fuck up, Feathers!
...
Shimura: You have got to stop smiling like you regularly devour the souls of small children and their pets.
Touya: *adrenaline wearing off, pain finally setting in* I have no idea what you're talking about.
Rock Lock: *standing over both of them* Exactly what was your plan back there?
Touya: Obviously, I was thinking I could get control of the steering wheel. Not my fault the driver had the nerves of a dandelion. Also, I'm not the one who thought chasing down an armored vehicle with four-door sedans was a good idea, so why I am the only stupid one here? Now everyone be quiet, my head is splitting and I just suffered the indignity of being carried away from an accident by my father.
Endeavor: Carrying you was easier when you were four.
Touya: The last time you carried me is when I was four!
