I have an old book it might be "Giant Snakes of the World". The author claimed xraying the contents of several large snakes.
Claimed one had an adult leopard in it. The snake had extensive scarring. Could have ambushed from the ground but more likely dropped on it from a higher limb.
I would think if he ate it in the tree he would stay there until he digested.
A big meal eaten on the ground I can't see climbing up a tree. D.C.