"No, no, that was actually..."

He hesitates. Even if it's the result of Sans' laser, Greg would hate to make it sound like it's his fault. Greg more or less made him do it, after all.

"They were like big leeches? Tried to... um... to wrap around me, and..." Trying to describe it out loud brings it back, and his jovial exhaustion gives way again. "Well, I couldn't tell what they were doing, but it might've been acid. I dunno."