That's what I thought at first but this is Andrea Galvao we're talking about. Due to that fact, I reexamined the move. There's too much going on here to chalk it up to poor body placement on the part of Galvao. Stewart gets the grape vine and then baits Galvao into the arm triangle. Once Galvao takes the bait, he extends his grapevine displacing Galvao's weight.
It's much more technical than it looks.
It's much more technical than it looks.