I had my gear on once to go up a dead american elm that was wrapped in vines. My plan was to set a rope and flop it. I clipped a vine to clear me a path up the tree and it fell over!
Vines are such a pain! They make most jobs harder, I guess this is the exception. It drives me crazy clip, clip, clipping just to have a huge ball of tangled up vines and limbs still hanging below trying to catch anythig you want to hit the ground.