Calus's shield is bugged. (Destiny)
It came up on Monday night and tonight how wonky Calus's shield is now.
Cozmo replied to a post on reddit today:
I spoke with the team, and we discovered our recent changes to combatant shields had an unintended effect on Calus’s shield. We are currently investigating. Thanks.
It's not a huge deal--we still didn't have any issues bringing it down, it's just stronger than it used to be. Something to be aware of if you're going to raid soon.