swing left, and look like this

[Delaware Golf]

Mark Evershed uses a laser at the end of a club and he demonstrates tracing a straight plane line after impact with a bent right wrist. He explains the hands have to move left to keep the point of the laser on plane. He calls it swinging the hands left. Is this what we're talking about here?

Based on Ted's comments, it appears the swing left is not coming from Evershed. The swing left concept that Mark teachs is acutally 1-L-15, a post impact condition.

DG