The Twins - Unable to play at all upon switching to Viktor right before he dies from timer.

STUVash

Step 1 - Have Viktor out somewhere

Step 2- Play as Charlotte with the ability to switch to Viktor.

Step 3 - Wait until Viktor timer is about to run out.

Step 4 - Switch (or try) to Viktor as he's about to die.

The switch function is called but Viktor is not available. The result is the killer player not controlling anyone in Charlotte's view. All you can do is either quit the game or wait until it ends.