There’s a short video in the level one presentation that shows a competitor in a different country leaning on a wall while he engages targets. The wall subsequently falls down as he shoots and he rides it down to the ground, hammering away at the targets. He doesn’t drop his gun, and seems to get a kick out of the experience, as does his fellow competitors in the peanut gallery. The point of the slide is that props need to be built to withstand their intended use, as specified in the rules.
2.2.6 Stage Props – Where these items are intended to support a competitor in motion or while shooting targets, they must be constructed with the safety of the competitor and Match Officials as a priority. Provisions must be made to allow Match Officials to safely monitor and control competitor action at all times. Props must be strong enough to withstand use by all competitors. (emphasis added)
The final sentence is separate from the rest of the rule and stands alone in its meaning: you have to build it right, and that mean everyone must get the same support and sturdy props. Competitors can be hard on props, especially if it’s something they must manipulate in order to solve the problem. Yanking a door open gently or barely pulling on a rope to open a port doesn’t work that well in competition, so they tend to treat props like this as roughly as they will when under the clock. The prop in question must withstand this use during the course of fire, but also during the stage inspection period. Build them sturdy and anticipate the 600 pound gorilla treatment. Prohibiting competitors from opening or manipulating a prop they must deal with during the course of fire isn’t an equitable solution to not building it strong enough.