Assassin's Creed II - Venice gondola glitch

Assassin's Creed II - Venice gondola glitch

Ezio leaps on to an unoccupied gondola. A guy appeared in front of him making paddling movements. Later (not on the video) Ezio leaps into the water and the mystery guy takes over the paddling, then jumps into the water as is usual when Ezio climbs back aboard.