Which Tarzan movie was it... 'X' tree execution

I'm browsing through the Tarzan titles and hoping to find a reference to something I saw in one of them, long ago, when I was a kid, that still haunts me today! It was a scene with a tribe of natives meting out punishment in the form of tying off two trees into an "X", tying a persons arms and legs, each to one of the four points of the "X" and then the natives cut the ropes that held the trees down, allowing them to snap back into upright position - AND rip the hapless soul apart physically.

I think also, this same movie had a similar situation where the natives were using a tree near a cliff's edge, again tied down so that it was bent over, and then putting another hapless victim in the tree, cutting the ropes, resulting in the victim being flung off the cliff by this tree catapult.

Does anyone else remember these scenes???? and know which Tarzan movie they were from???