There's a mechanic in the raid boss Dhuum in Guild Wars 2 where, sometimes Dhuum decides you don't need your body anymore and sends your spirit to go float around. But if you reaaaally want to get back, he'll let you collect a certain amount of spirit orbs so you can glue yourself back into your body.
This was during the first time I ever did Dhuum, and this mechanic was not explained to me because I was not the designated person for this mechanic. However I managed to complete it and get back to my body anyways. Turns out I didn't have to for that run, but I know mechanics when i see them so I did it ahah.