Well done!

You have managed to duck and dodge your way around the Whomping Willow’s wild branches with minimum damage. Good thing since it looks like your potion is starting to wear off.

The branches continue to crash around you as you jump forward and put all your weight against the knot. Fortunately that has done the trick, and the tree has been immobilized. And not a moment too soon!

Looks like you now have access to the hole near the roots.

Time to see what is down there.