It's pretty good! Though, I would suggest that once a point is won, restart the game, because it's easy to lose 4 points because you can't get back the ball in time, however the CPU manages to. Still, congrats. :)
Lulz. Quick baron explanation: Reducing his focus to 0 means that he casts a buff on himself which swaps health for focus. Each turn he loses (I think) about 5,000 health and gains focus. Keeping on draining his focus and he eventually kills himself. Fully upgraded disrupt for Bio.