Sweet we've got a shot at beating Thor... oh ... *ragequit*

[Flammy]

This can't be fixed. It is not map fault.
Assassins spawn near players so try to stay away from walls when they spawn.

Would it be possible to make assassins spawn at normal spawn, and be invisible until they attack?

Or if not at normal spawn (too far or chance to get bugged somewhere) give them a few spawns around the map, especially near where people like to hold?