All bands like to surprise people a little to some extent, Fall Out Boy for one have never shied away from it. That being said, when they announced that Professor Green was supporting them, there was a pretty overwhelming sense of confusion. As he arrives on stage he, more than anyone else tonight, has the job of convincing everyone he was a good choice. To be fair, he kind of did it. Still a very random choice but he puts on a decent show. Professor Green is joined by Dream McClean and Katie Holmes, the latter who impresses particularly with…