#chained down

This one got away from me and started unfolding by itself...

“Please, just listen to me! You don’t have to do this!”

Whumpee cries out from the stone altar where he’s tied down, arms outstretched to either side and fastened to a pair of iron rings. He has only seconds before that knife, the one clutched in his friend’s hand, embeds itself in his chest.

“This is insane, don’t you get that? There has to be another way—”

“There isn’t.” His friend’s answer is monotone and lifeless. “I checked. I have to sacrifice the person that matters most to me, and that person is—you.” He advances toward the altar.

One last chance. Whumpee’s throat constricts with fear. The chains rattle as he struggles to sit up. His arms are pinioned too tight for that. He collapses back down.

“You don’t have to kill me! I’ll give you my blood anyway! Don’t do this—”

Too late. Whumper is already standing over him, blade suspended over whumpee’s chest.

What would you do to him?