We actually hoping players will figure out the best strategies to use in stage 5 of the Training Ground. Of course there is more than one strategy one can use to pass it.
Here are some hints: 
1.Make sure Zia deals 100% damage.
2.Make Gable trap 2 enemies, making sure they cannot attack Zia in the back.
By the way, the record time for beating the stage is 20 minutes so far.