"Not now Harry, and no you are not dead. Merely chosen. You are here at random, or should I say, nearly random. The portal is alive if you will, it purveys battles of its choice and picks warriors of above average performance. Normally it chooses on kills, but in Harry's case it probably chose on mental capability. That doesn't mean clever, it means he stays in one piece when all others fall. In fact, the portals just given me your kill count now.. Hmmm, Harry, 0. Alfred, you got 43. Sergei, 36. Charles, 28. Rachael, 12. Rafstan, 26. David, 17. Dylan, 3. Mr Roaring Bear, 19. Rognvald, 13. Sean, 3 and Aiko got an impressive 83. These are the reasons the portal chose you, an impressive kill count or exceptional ability, be that intelligence or balls I do not know, the portal chooses itself. I advise you now to get to know each other, you'll want be surrounded by friends and not enemies, come your first challenge."
