I wouldn't know. What should one do with a moose in that situation?
Leave the area and don't make eye contact.
It will leave you alone if you are quiet and don't seem like a threat.
Be as quiet as you can and back away quickly.
If you can't leave, hide behind a tree or another object so they lose track of you.
They will just walk away.
They are not predators, if you turn away and leave as fast as possible, they will not follow you like a bear or cougar. Only people who antagonize them or intimidate them get attacked, like this guy did.