Re: Cause and Effect (??)
If tyhe Enterprise had changed course, the Boseman would have emerge, hit nothing, and found themselves in the future.
The Boseman "looped" exactly as many times as the Enterprise did. When the Enterprise exploded and reset (how many hours?) the Boseman still being in the area of the explosion also reset the same time period.
This is pretty much exactly what I got out of this episode. The Bozeman was flying around in 2278 then flew into a temporal anomaly leading them 90 years into the future. They collided with the Enterprise and the resulting warp core explosion interacted with the temporal distortion in some way as to create a temporal loop of some arbitrary length, resetting both ships back a few hours in their respective timeframes. Bozeman wasn't trapped in the loop for 90 years, they were trapped for the same amount of subjective time as the Enterprise. They just happened to travel 90 years into the future during the loop.
The Enterprise seems to be a lightning rod for Starfleet ships falling out of temporal anomalies from the past.
"You have been examined. Your ship must be destroyed. We make assumption you have a deity, or deities, or some such beliefs which comfort you. We therefore grant you ten Earth time periods known as minutes to make preparations."