Explosives cause explosive consequences.
This so called tactical instructor forgot that main point.
Check out what happens when physics set this tactician straight.
In a video shared by Wim Demeere’s Page on Facebook we see a fellow that just doesn’t get how physics works.
While “instructing” a class he throws a grenade into a building and shuts the door quickly. He then holds the door shut. Big mistake. When the blast occurs the pressure wave slams the door open and blasts this brilliant operator sending him flying.