mechanic question: dead ball vs. down indication

[Texas Aggie]

I don't know about Mass., but Texas HS has not adopted the 40/25 clock rule. We use the 2005 timing rules and probably will indefinitely. However, our wings typically raise a hand to eye or possibly top of the head level (as opposed to straight up like a basketball official signaling a violation) with the next down. I'm not sure its an actual mechanic, but its something we've done for a while.