What if there are two paths connecting to the gold in Saboteur 2?
There's no such concept. The following are the win conditions for the red and blue teams from the rules:


A team wins if a dwarf from that team creates the connection to the treasure and the way there
isn't blocked by a door of the other color.
A team wins if a dwarf from the other team creates the connection to the treasure, but the way there for his or her own team is blocked by a door of the wrong color.
Both teams win if The Boss, The Geologist or The Profiteer creates the connection to the gold and the way there isn't blocked by a door of the other color.


A dwarf from the blue team created the connection, and there is a path that's not blocked by a red door, so the blue team wins, and the red team does not. That's it.

The only way the red team can win if a dwarf from the blue team creates the connection is if the blue team can't win (i.e. every path is blocked by red doors).