Thanks. I'm still buzzing from this trip days later.

Here's a couple of vids one of the guys took of the second rattler.
It's almost frightening to watch the slow-mo striking one as at the time it actually looked cute as it nipped a couple of times at the tongs while Adam gently tried to coax it into the hole. The vid makes it look a lot different.

Slo-mo strikes: YouTube - Prairie Rattlesnake strikes - slow motion

Close up defensive posture with rattling: YouTube - Prairie Rattlesnake defensive posture