Just in case I wasnt clear enough with the rules. Here they are:

1. To win you need to fulfill the follwiing conditions:
-Keep BubbleGuard from getting a total of 5 points worth of staff.
-Capture BubbleGuard

2. For BubbleGuard to be awarded points, he must "capture" a pony in a bubble. The bubbles are actually easy to break but even if a pony is saved from it, BubbleGuard gets to keep the point.

3. Prince Sombra has a value of 2 points. Jaeger has a value of 3 points.

So, yeah, the whole point of this exercise is basically to be able to defend yourselves and those around you.