It seems to require a certain time of input time to properly activate the warpath, regardless of whether it is moving or stationary.
(at least 1 sec or weapon attack speed?).
If one momentarily pushing the skill button, warpath continues to activate. At that point, when the mana reaches zero, it continues to do a strange dance with no attack collision.
This dance can be cancelled by any skill other than warpath or by moving or get stunned.
2 Once the bug is triggered by momentarily pressing warpath, and then activating Warpath again correctly (inputting constant time) and releasing the button, the dance with no attack collision is then possible while moving.
If then press warpath to meet the conditions of 1, warpath is back to state 1, and can enjoy the dance of 2 again if meeting the condition 2.
This problem has not happened in 0.8.5F.