Yoshi/Joshi no straight jump out. That alley would be at least 4+Stories high. Jumping up before you used ledges.

Also no Force Wave down the alleyway. 

You can't have just happened to learn a new skill in the heat of battle. People who don't know Force Wave while being able to throw a couple of objects can't fling a whole alleyway at people and the people at the end of the alley at the same time.