[{quoted}](name=Inept Maverick,realm=NA,application-id=3ErqAdtq,discussion-id=4oOMIa8m,comment-id=0005,timestamp=2015-09-15T21:22:35.296+0000)
Same way a Bard ultimate impacts a team fight in a positive way. Position this on a Marksman and keep the enemy team out to make your Marksman instantly win the duel. You guys won't like this, but this ultimate actually synergizes pretty well with ADCs that can keep enemy's out of it, such as Kalista, Vayne, and Tristana.
It can also be good on allied champions who are more delayed damage oriented such as Zed. Speaking of which, it also hard counters those ultimates since it makes them unable to kill the targets inside. Not to mention the ultimate is also REALLY GOOD if you are on the losing side of a team fight. If your team was instantly at a disadvantage, throw this baby down and you got a team that can't be killed bursting down an enemy team with that can't fight back, excluding crowd control.
Basically, its a game of territory with this ultimate. You throw it down, both teams want to make the other team GET OUT!
But the problem with your last statement is that both teams want to make the other team get out right? Well, I feel like people could just walk back in, waiting it out, and at the end healing themselves. If a team is already steamrolling your team, they are just going to be able to focus everyone instead of one person, and burst them down once the ultimate wears off.
Working with the enemy, this ult is tricky, like Bard's. I can't say I like it as much though, since it can still heal enemies as well. It's one thing for making them stasis, but it's another for still allowing others to damage you, heal within it, and even cause themselves not to die when in it, saving from critical moments.