Charger cliff "effect". glitch or game-mechanic?
So I HAVE to ask this, because I couldn't find a topic dealing with it already (if there is, please comment a link)
On the Dead Center campaign, first chapter. At one point survivors have to pass along a narrow pave on by the wall of the hotel. This place is ideal for chargers to do their low trick of pushing a survivor down to instantly kill them. But can we please analyze?
Charger effect: Aim at survivors, and execute a straight forward charge, grabbing the first survivor in contact, and then push them to the next wall (or a certain distance), where a severe pummeling begins until the charger is killed. Technically.
Cliff effect: If a survivor is pushed (e.g. by exploding boomer), pulled (by smoker), or accidentally walks over a cliff/ledge, he/she is put in a "hanging" position that requires the help of another survivor to be saved from, like getting knocked down below 0 "standing" health.
Question: Is the fact that survivors can be instantly killed by the method discribed above a glitch where the "charger effect" skips the "cliff effect", or is it intended to give the infected this tool of insta-killing survivors? Because it seems like it foregoes both basic game mechanics described above, and massively unbalances the game in these areas, making versus game a contest/game of luck simply about who can do this (more).
If the infected manage to do this, the 3 survivors will have an immensely more difficult job against 4 infected, and this section is quite early on the map.
Sidenote: Last time I encountered this, I gave voice to my opinion regarding the low ethical value of this maneuver, to which the reply (simplified) was "I have more "hours played" than you, so shut up". He also forewarned more such methods, which I did not hang around to check, so I presume either this is possible at other locations, or there are other methods like this.
So is this really a valid move, or simply a glitch that is very difficult to fox?