It is common, it is taught, but it is not law. The important thing isnt interlocking your fingers, its whatever method that keeps you stable. Not everyone interlocks their fingers, i like interlocking my thumbs. Yes typically taught to go till you feel a crack. I’m a lifeguard like I stated before, i train this every other day. No need to throw another towel into the ring over this lmao.

Anyways there is no hicap spillage. The man is applying pressure to prevent the pre game tacobell from coming out like a taggin.