That - makes him draw in a horrified breath. The thought that whatever this is might use Ben again, make them repeat all this pain and suffering - god, he can't even handle thinking about it right now. At least it probably can't act during the daytime? Undead can't really cope with sunlight, so ...

Deep breaths. Real deep breaths. "I saw him just fine," he says. "And - he said he'd come back." So that implies that Peter can see him then too? He's not sure how he got the ability to see dead people okay. Just another weird thing on top of everything else. "I gotta protect him. Find whatever it is that's doing all of this."

That has to be the answer here.