This version of the pass can be incredibly effective; over the years, I would struggle with partners who were very good at this. Start by sliding your knee across and lifting your other leg, per usual. One common response is a leg scissor; this can be incredibly annoying for the person passing, and it's appropriate guard maintenance.

As soon as the scissor comes into play, it's time to think: direction change. Swim under the leg they're using to frame (be careful not to tweak your partner's knee during this step), and then grab the collar once you have their leg jacked up under your shoulder. Now it's time to treat this guard pass just like a double-under pass.