So, an app crashed, the crash handler window asking what to do with the crash pops up, and the system is very, very slow because of the crash. The cursor gets to a very low frame rate and with very a lot of delay, so I can’t simply click on the option to close the crashed app. Ex: Blender/video editor/A game crashes and slows down the system while you’re using your internet browser, so instead of super slowly trying to close it, all you needed to do was just press Alt+F4 or Meta+Ctrl+Esc on the crash handler window that pops up in front of whichever app you’re currently interacting with. The message on the crash handler window should have “(Alt+F4)” and "(Meta+Ctrl+Esc)" added to the option that closes and kills the crashed app. If the crash handler window is not on focus, there should be an visual indicator so users don't close/kill the wrong app.
But then you couldn't close the crash handler window itself in the same way. Wanting to is a legitimate activity. So even though I understand the frustration that prompted this request, I don't think we can do it, sorry.
An specific shortcut to specifically do this thing would also work, so it's possible to have both at the same time.