There is a raid mechanic that is not timed correctly.
Calus:
--Taking down his over-shield before he wipes the party.--
You are able to take it down, however if done close enough to his wipe attack it will still wipe you. He staggers, stands up, dogs spawn. Calus starts casting his fireball, and then the whole team wipes. And the whole team is killed by his over shield which was taken out almost a full 7-8 seconds prior.
Scion Projections:
--Killing the projection, it still sometimes detonates.--
Same as Calus. You can kill the Scion Projection. It will even disappear. And right when it disappears or even after it's totally gone, it still "detonates".
--Why the hell hasn't either of these been fixed yet? They have been happening since week 1 of the raid!--
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This happened to us too last night and a few times previously. Seems to only occur, for us, when we one phase him. The only tactic we changed was to extend the damage phase to two phases. Hope this helps. Good luck, Guardian.
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Just play it safe and kill the shield before you can't see anything anymore. I know it's annoying, specially when others are angry because you did something wrong when you didn't