The officer complies, just as he said he would. You follow his directions out into Westfall proper to the one stronghold under Stormwind's control. Upon entry, you're greeted by the leader of the stronghold. "I cannot thank you enough, warrior," he says. "You have returned one of our militia's most valuable members to us safe and sound. Tell me, how did you manage to restore Protector Bialon to our service?" You explain to him everything important that has occurred up to this point. When you finish, he begins giving orders at once. "We must put an end to this fledgling Defias!" he says. "Let none suffer as the land has suffered before! To arms, men! We put a stop to this insurrection from the Deadmines at daybreak!"
Help the leader invade the Deadmines. Leave Westfall like Bialon said you should. Looks like Stormwind has things under control.