Being one for details, Donnie's at least 90% sure that crack hadn't been there a moment ago. He glances at Serph before edging towards it. Maybe walking towards suspiciously appearing cracks is not exactly a great idea, but how else do you learn things?

"...whoa..." he breathes, not at all having expected to see what he does then. A glimpse of something completely different, inviting, a contrast to their stark surroundings now.

Donnie looks at Serph again, brow knitting at the response. "O-oh..." he murmurs, a little sorry he asked.