And everyone else would out pace them since titans can't place bubbles faster than you can walk. If they come out of their bubble shields they'd be shot be the GG which is an instant kill plus AoE which would hurt all inside. They can't go out of their shields while GG is out and hunters can't attack them head on while they're on their shields. They would have to stay on the defensive end which would let hunters get all the warlock kills and thus win.