This case seems like that bug where the game decides not to spawn someone into the instance properly making them invisible to the enemy team. The only damage said person can do is grenades and supers.
The invisible person can be killed if they remain in someone's line of fire or stick to close to a teammate on the receiving end of a Grenade, Super or Rocket, all of which are very very very rare cases as the bug allows you do go beyond enemy lines and dance unnoticed.
Doesn't happen to just Red-bars as it can also be linked to whoever the hell is hosting the match. As far as glitches like these go, this one is relatively common.
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This hasn't been my experience as I have been sniped by an invisible Titan just today in supremacy. It's not just grenades AT ALL. Once he sniped he popped up out of thin air. I had been watching the doorway for a straight 15 seconds for a teammate and he appeared out of nowhere. I do see it happening a lot with supers too, especially stormcallers, where they are right behind you and they don't show up on radar until you're dead. The lag can result in all types of unruly encounters. It's not necessarily always considered a bug it's more than likely lag and bad ping, where the enemies haven't even registered on your screen yet till it's too late.
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I know how it happens and I know there's little I can do to stop it. It's just super funny that it managed to happen in this way, lol.
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Yeah, my missus has started a crucible match twice recently where she was completely invisible to everyone and we noticed only nade damage was being registered. Odd bug. The ones I hate are the ones that don't register you've killed them so you keep at it, then they kill you, then they suddenly drop dead as all the hits register. I've attached a video of mine where it takes a full almost-point-blank Plan C centre-mass shot, a full charged scorch melee and a fusion grenade to finish them off. But I've had worse.