They will eliminate each other. Unless, of course, it's a player with no upgrades, etc.
It could be funny with Gollum if there are no other negatives left, and the town gets tired of trying to figure him out, even with live checks, not to mention that the checkers could get killed. A draw, a TIE?)
Added after 55 seconds
However, by that time, many roles will already be clear from the blocks, so it's fine.
To sell my soul