yes, using telekinesis
can he not use tk on the ki sphere
Yeah, for like 1 part of the first attack, he swings the SOUL down, then he switches to regular attacks on the SOUL.
None of the other parts of his opening move are telekinetic.
& IDK if that swing can deal damage to the SOUL, as opposed to being just to move the SOUL into range of his bone wall. It didn't do damage in that video. If that swing CAN damage the SOUL in regular gameplay, correct me.
Meaning unless Sans oneshots with the telekinetic throw of his opening move before it even gets to the presumably dodgeable or perceptible bones & Gaster Blaster beams of his opening move, Sans will be dead to a ki blast's AoE very quickly.
Sans likely also won't know to deflect it; He's skilled, but lazy & avoids conflict, & while projectiles are ubiquitous in the Underground, I doubt he'd have much reason to expect the shot to explode on impact with something.
A lot of projectiles in Undertale, IIRC, don't explode, much less the energy attacks, & of those that do explode & that are energy attacks, how many has Sans seen?
Sans would know to dodge/deflect it, but he wouldn't know to he needs to be far away enough.