//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif I've already explained the pool one. He is walking on polycarbonate / plexiglass supported by thin columns. Note that the people don't stand up in front of him. There is a hole cut out where he drops his shoe in. Again, the audience is COMPLETELY in on it, and he openly admits it on the penn and teller radio show. He has no magic powers, just cheap illusions and camera editing. Link me to the fireball one.
You have to accept that magic is merely a ruse, and often a very expensive one when you have to pay off people to not reveal your secrets. Any time a magician does a transportation illusion where they reappear amidst the crowd, it is always in a similar location and note that the people are rarely screaming. Most people just aren't good actors. Trust me, magic and illusions are as simple as you think they are, which is part of their mystique.