As Strange makes his sudden drop, Viktor is deciding on which vine, or vines, will be safe to remove without introducing a similar hazard into his present circumstance. The last thing he needs is a collision with a stone floor, from any height, let alone this one—

Oh, there he goes.

Were Viktor a stranger to this particular doctor, he might be alarmed. As it is, he simply bears witness to his descent, for posterity, though he expects no tragedy; it's more that he may need to relay this story to someone later, and wants to get the full picture of him tumbling stupidly, tangled in his cape and all. And here, even operating at half dignity, his first thought is to ask if Viktor is okay. This is why they're friends. (Well, this and a rock-solid foundation of shared scientific mania spent finessing local magic so they could alter time itself.) (They're friends, by the way.)

"I'm fine," he says, and then, "I have a knife."

Which, after a conspicuous look up, and another down—body language says he's pretty sure he's got it figured out, in that he probably hasn't, but is prepared to make a decision—he now uses to cut through one of the stems. Begins to, anyway. This is not a big knife.

Conversationally, while sawing, "That did not look intentional. Does it do that often?"