This is why I posed this battle. And even if Sue trapped Colossus, what's to keep Kitty from phasing him through Sue's force field?
Her lack of sight, If Kitty can't find him she can't phase him out. As it has been already stated if Sue stays Invisible and Kitty stays phased then there really can't be a clear winner, hence why its a stalemate.
@granitesoldier: This is an interesting battle, the problem is that both can fall back to defensive mode and the battle becomes Stalemated.
Personally I think Sue and Grimm have the advantage here in that if they played it smart they could try to make Colossus invisible to take him down. Although the typical stuff Sue has used to drop Logan wouldn't work in Peter here. But even if they did manage to take down Colossus, how would they take Kitty down?