Lancer Skill "Leg Sweep" doesn't interrupt enemy cast until animation ends

[Gideon]

This is really frustrating. It makes us feel like we while we didnt do anything wrong, we get screwed by poor design. Even though Leg Sweep is off global cooldown, I have to wait for the first animation to finish before the leg sweep animation goes and the stun doesn't even take effect until after THAT animation has completed! So the first skill animation lock is ~1.5 sec, leg sweep animation lock is ~1.5 seconds. So, if I use a normal skill, and the enemy begins to cast, I have to hope the skill he is casting is >3 second in order to have a prayer of interrupting and that's IF I have perfect reactions.

Chimera is incredibly frustrating due to this.