ok, everyone try to look at it like this:
a mute grab, no matter whether your skis are crossed or not is when you take a hand (lets say right hand for this case) and grab around the front toepiece of your other ski (left) with your arms IN FRONT of your shins. (TRY THIS IN A CHAIR)
now for a seatbelt:
take your arm (right) and reach it across your body to your left hip. now tuck your legs up and try to grab your left foot in the middle of your foot (same place you would grab for a left handed safety) notice how fucking hard this is to do just sitting in your chair. think about how much tougher it would be in full ski clothes, boots and skis.
turpin is pretty much the only kid that i know that can do this grab that well. he has those long dangling arms that let him reach that far across his body.
people, if you are going to try to say something (like: 'no, there is no such thing as a seatbelt grab, it's just another name for an uncrossed mute') please know what you are talking about first. this is a waste of my time to explain shit like this, but i do it because you obviously aren't respecting the trick/grab for what it is and how fucking hard it is, and i feel that chris deserves the credit.
*smack*