Not much to say, was positioned behind an asteroid, when a larger ship fired its guns (whichever cannons/missles/whatever are blue), they impacted the asteroid immediately adjacent to the larger ship. The game halted then crashed to the main menu.

Crashlog indicates:

Crash caused by: core game update unhandled exception
Collection was modified; enumeration operation may not execute.
mscorlib
at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
at System.Collections.Generic.Dictionary`2.ValueCollection.Enumerator.MoveNext()
at CoOpSpRpG.BattleSessionSP.localUpdate_Patch1(BattleSessionSP this, Single elapsed)
at CoOpSpRpG.BattleSessionSP.update(Single elapsed)
at CoOpSpRpG.VNavigationRev3.Update(Single elapsed)
at CoOpSpRpG.SCREEN_MANAGER.Update(GameTime gameTime)
at CoOpSpRpG.Game1.Update(GameTime gameTime)
Void ThrowInvalidOperationException(System.ExceptionResource)