Box and No Box

We use a 4th protree in Our local 7.0 index class , we had a few of the guys push and push until delay boxes were allowed,
Am I Missing something,
Only thing I can think of is they have found a way to go red and the box allows them to slow the reaction down,
They are still leaving on the amber As all the ambers come on together I would assume,

This has been bugging me for a while
Sorry not my intent to hi Jack the thread ..
I don't know any box guys where I race that could slow their cars down enough to race 7.0 (I'm assuming 8th mile) They are all 5.80 and faster.
I think changing the index rules for these guys is crap.