If you start a strike, heroic or regular, you get matched into a team. And being a team means working together, not repeatedly trying to run past all the enemies while the other two work their way through them, and dying, leaving the other two to kill all the enemies while you wait to respawn
Seriously, i've had 5 strikes today where someone kept trying the "mad dash" tactic. If you're there at the start of the strike, you shouldn't be ending it with less than 30 kills while i've got over 170
(Edit: the point i'm trying to say here is pull your weight, and work with your team. Don't be some idiot that runs off by themselves, dies without even reaching the next checkpoint, waits to revive, and then repeats that process multiple times in a single strike. It's basically the equivalent of sitting in the back doing a dance emote while the other 2 players are killing their way through
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The last time some muppet tried to do that, my friend and I watched him die repeatedly, trying to dash through everything. Then when he eventually pulled us through to the boss we didn't res him once, preferring to dance and teabag his ghost. He quit, no doubt foaming at the mouth and cursing us. We then blocked him because we don't like being paired with blueberries who are shit.