LET THEM GET THE KILLS. All you guys are saying supers charge slow. The more kills a teammate gets with a super, the more orbs they make. Those orbs will charge your super. Don't be greedy. Be supportive, let teammates make orbs.
Problem is, how often will you be able to get more than two kills with a super? At most you'll only run into 4 enemies at a time. And they all have to be close to each other. Most likely you'll run into 2. Also since you get supers so late in the match, chances are if you don't use it right away, you might not be able to use it at all. I had two matches that way where it ended before I got my super.