This is actually easier than Sans was expecting, thanks to what was apparently some kind of internal corruption in the Circle - some of the other angels are managing to make a bee line straight for those private chambers, which means that Sans is working on scouting the periphery. Which also means he has some time to snoop around.

Which, he does! The Circle obviously has some secrets they've been keeping, and most of the time a Circle HQ would be off limits, even to an angel. No harm in a little bit of property damage between friends, right? He knows there were going after a ton of randos in the last few weeks, and so when he hears some cries for help and comes across some warded prison cells he can't help but be curious, and at least a bit sympathetic.

He swoops towards the door, and deftly cuts it off its hinges with a swipe of his angelic scythe. As the metal door falls into the hallway, the angel is left floating on the other side, staring in bewilderment at the familiar figure inside.

"...Seriously?" he asks.