I've had this happen three times now, twice on Earth and once on the moon. Here is a video showing one of them.
What happens is I'll be running around the map in Patrol and suddenly I can't kill the enemy, no matter what I do. It just keeps popping back up with full health. If I click the Orbit/Sparrow menu button on the controller and then click it again, I can then shoot the enemy and kill it. That's exactly what you will see happen in the video.
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Happened last night while doing VoG. Our teammate that grabbed the relic/shield, during the templar, was trying to kill harpies and such to charge it up and couldn't do any damage. I suggested he press the button that brings out his ghost and then press it again. Once again, that fixed it.
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Bump Just had it happen again on the moon, during a public event.