There's several options. Can you open the map before it reloads? If so, fast travel away.
Can you log out?
If not, have a friend invite you to their game while you are not in yours. Their invite should show up in UPlay friends list. Just accept it and join their game. Go to a public place such as the the Terminal. From there, you should be able to leave their game and you should stay in there. If you don't have any in-game friends, just PM me and I'll help when I get home tonight (6pm CST)
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