/mememe

I can help you with that.

There are basicly two ways you can proton kill a 'fellow' teammate. The first involves the good old confuse, which was already pointed out.

The second involves neutral objects, like the transformators in the cure. The player targets a worker drone, beam hits it, and the second 'jump' of the stream has a quite high chance to be the transformator. The third jump then either hits another worker drone, or if some other player is close it goes ZAPP and we have a dead player.

So my guess would be if you disable the ability of the beam to jump onto a neutral target you could get rid of 90% of the friendly fire incidents.