Yes, I think that's possible. The other alternatives are that Gary will get involved with similar results, or that Liam self-harms to get out of school, which could have awful consequences.
I don't know how a story like this can end well really, unless the Head Teacher catches Mason in the act and he gets expelled. The actor playing Mason is a good looking boy, so the chances are that he'll be in it for the long haul, though. I know soaps have a good record for exploring difficult issues, but where children are concerned it has to be handled so carefully, and in this case it is really hard to know how they can do that without suggesting that Liam takes action that might not be wise if copied, or that he somehow brings things upon himself. Leaving the resolution to chance won't give much hope to young viewers either.