Why isn't there a fail-safe option to get to task manager?

It's happened a second time before only this time during ranked game. Client freezes and I lose a game because of it. Sadly, I can't just ctr-alt-del to task manager, because client is full screen. I guess I could play windowed, but it sucks playing with bars atop. For quality of life, there should be a fail-safe to get out of a full-screen game when you client freezes completely.
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