Quentin will probably be at the docks and will not like the fact that innocent people are being kept as hostages, and really, really not like them taking off with Eliot. Quentin knows some battle magic (which is nerfed to be less powerful than canon, but still--) and he specializes in minor mending magic which might come in handy if anyone gets hurt or if anything gets broken (like it says on the tin - only small objects need apply).