There's always a way to do things that aren't "usual". Most of the times, those achievements happen in situations of great fear or great adrenaline. I imagine that this was what this cat did when he escaped the one sitting on the car. Fear and adrenaline... he ran up this tree like if his tail was on fire and stayed there until it was safe to come down again. The pursuing cat (whose owner is in the background looking at the scene) ended up being chased away by her owner...