[...Well, that counts as feeling something. To get a closer look, Shun briefly slips off the branch, catching it with his legs and hanging upside-down to peer at the earth for a moment before swinging himself back up with no apparent effort.]

No, but I think that root might've just moved out from under you. [He points at the largest root of the tree opposite, which is facing them - if looked at for long enough, the fact that it seems to be rising subtly is noticeable.] Take a step to one or other side and see if the ground feels firmer.

[At this point, his eyes are flicking between Fubuki and the tree, because whatever it's doing, he wouldn't put it past anything in this forest to pull one over on them while they're distracted.]