Holding or not

[sm_bbcoach]

Got into a "conversation" with a coach this past weekend. He cornered me at another conference and began to aksd how and why. We called Holding on his line about 7 times in a game. The linemen would inital charge and hit open hands at the chest area. Then slide down to their knees, wrap or encircle them(clasping hands on back side: umpire noticed this second play of game told them to not do this) then brought the d-linemen down; ie tackled.
Please inform me if I am wrong and I will eat my crow. BUT is this HOLDING????????? I think so, coach says i am nuts. It is not. O line men CAN do this. I have looked in the rules/case books (NF rules) and can not find anything to support it.
Thanks!