It does tear through, and Leo's hand is released. He yelps in surprise, but yanks it back through the portal without incident. The portal closes behind him with a snap.

"Uh, so, maybe you were right about the tree," he notes, backing away a few steps and rubbing at his forearm. He's not hurt, but-

Unfortunately he's stopped before he can get too far by another vine wrapping around his ankle, tugging at him.

"Oh come on, this is getting annoying!"