Thinking always of the fact the very first thing Caleb does after being resurrected is use the last of his strength to limp back to Molly's side and beg the others to resurrect him. Even though Lucien was the one who killed him in the first place--

Caleb saying, "Get him out of there," when Molly was still trapped in the ruins of the city. And when Caduceus gently suggests they wait until they're home to try and cast the ritual, Caleb insists, "No. Now." Because he's seen Molly suffer enough, because he can't bear the thought of making his Circus Man wait another moment longer--

Thinking of how Matt described Molly as, "Bloody, naked, still a heavy gash in the front--lifeless." Caleb seeing him like that and immediately reaching for his Transmuter's Stone, refusing to accept that he'll lose Mollymauk like this again--