One of the many weird things that Sheer Force negates is Emergency Exit.Emergency Exit didn't work as intended in an RU match. With a backup mon, golisopod was brought down under half for the first time and the ability didn't activate. However, the start of the next turn, it forced them to switch out without saying the ability activated.
Here's the link to the battle:
Your opponent, likely assuming that they were forced to switch and not realizing the turn had already ended, hard-switched into Rotom.