Personally, I prefer the team shot approach but can't rely on teammates to be on the same page since I run solo. If you're going to try and snipe them, remember to aim a little higher than normal. Shotgun, make sure they don't see you, get as close as you can and follow your shot with a melee. Priming them with a nade is also a good idea either way. If you hear one activate, QUICKLY assess your surroundings and act accordingly. If you can't kill them, do your best to make them waste it. Titan skating is very effective at doing so. Even if they do manage to catch you, they might at least not have enough energy left to make it to your spawn, even if they still manage to get multiple kills. Also, if you die to one, watch them and don't respawn until their storm prance is over. Nine out of ten times they are heading straight for your spawn with a super that lasts nearly half a minute.