be best if your biological just use the same tactics on him as you did with the baron, although draining jimmy's focus will NOT make him cast a buff to damage him so he can restore focus
NO do not try to drain his focus!!! Use the withdrawal combo it will kill him one shot! Respec and put all your points in spd and get the skills for the combo.
If you're doing a legend run and don't have the combo yet, draining his focus every turn while your teammates kill him works, it just makes for a longer fight.
Real hard I think. It might help to know that you have to get more than he recovers with the health-recovering move. I used withdrawal and leading strike and destroy the most, they drain the most health.
Dude, dont worry about all those friggin tactics. If you are hydro or bio just knock the crap out of him. thats what I did and I killed him in 3 turns.