It will depend on the module and bus boards of course, but in the example above I’ve confirmed that you will get all 3 of your bus board’s power rails shorting through the electrolytic capacitor housings protruding from the back of the ER-301. Basically, your bus board is a bristling forest of pins with live voltages and lots of current ready to ruthlessly flow into any part of a circuit board that happens to fall on them.
Most things in life are worn down gradually and then finally fail due to what should be a typical and easily handled amount of stress (the proverbial straw that breaks the camel’s back). I find that big catastrophic failures that are clearly connected to a single cause are the exception rather than the rule. For example, ESD is well known for dramatically reducing the life span of components without causing immediate failure. Typically, unless a component is specifically designed to fail dramatically when its specifications are exceeded (like a fuse or some types of diodes), they just degrade (especially capacitors and mosfets) until the circuit that is relying on their performance no longer works.