Frisk moves, grace that only comes during conflict propelling them between the two in only a couple of dancing steps. Instinct, mostly. Get between them even if one's pushed the other away--

(they're pushed, they hit the Blaster, Sans don't die don't fall down their face is bleeding)

--nobody, nobody is dying. Except them, should the worst happen, which it might not be.

They glance at armed-Chara and nod--they look at Chara signing and sign back too. No. Shh. See you.