Yall... if Goldi is the one who controls the mirror world (with the tickets? If that's even true), then obviously our MC needs to get her to allow him to leave. Think about what will happen if she dies. Her ability might just implode and take them all out. Or, if she's knocked out or incapacitated, we don't know if the ability will persist or what.
He needs her to agree to let him and Dahlia go