Unless this elevator's suddenly hauling itself beyond its normal speed capacity, getting crushed shouldn't be an issue. There's undoubtedly fail-safes installed in the event of an emergency, not to mention there should be considerable space above and between the elevator roof and any present ceilings.

[He's just a bit anxious, let him blather a bit. But with things slowing down, he knows it's game time and so he prepares himself.

While Accelerator moves to one side, Donnie moves to the other, gesturing towards the top with Leo before pointing at his own shoulder. His brother would be better off getting the drop on anyone from above, and at least now he has somewhere to brace himself against.]