The rest of this trial will be prosecution smoke, diversion and distraction.
The government prosecution will be putting on totally irrelevant witnesses, and witnesses who are not even remotely pertinent.
The prosecution has clearly hit the wall.
Z does MMA practice 3 days a week?
This is almost beneath circumstantial. Apparently the prosecution wants to portray Z as having been on top during the fight at some point in time, or able to defend himself adequately against a much larger assailant from below. Desperate... Fishing...