my guess is that the reason he's even trying to "capture" is because it's his job, eventually if you stall him long enough (in pacifist) he'll call his "break" and stop fighting, right?
UT:SD is kinda my take on Underswap. Instead of changing roles AND personalities, everyone just swaps roles! This means Sans is not obsessed with capturing the human.
Link to this sequence: 2552841
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Undertale: Swap Day - Sir Jokes-a-Lot by StarStorm