Cobra lunge is described as lunging forward before an attack if the target is slightly out of range. In game it is usually triggering immediately after finishing a target, and lunging to a far target and only getting half way and whiffing and not lunging again.
If there is no cooldown, this is then 2 bugs (not lunging again, and lunging from too far away). If there is a cooldown it should be stated in the text. The description of this move sounds the smoothest and greatest QOL skill point in any game ever, but in practice it’s a bit weird.