Weird, a 90 solar mass star is pretty heavy to get kicked to that speed. They say that 30 Dor contains several stars weighing > 100 solar masses, but those kind

Weird, a 90 solar mass star is pretty heavy to get kicked to that speed. They say that 30 Dor contains several stars weighing > 100 solar masses, but those kinds of masses are very near the absolute upper limit to how large stars can form. Generally to get kicked to very high velocities, you need to interact with something more massive than yourself.