Using Ivara's navigator with quassus breaks Ivara.

[Konkrissu]

Using navigator with quassus. The blade is correctly navigated with the ability, though after navigator ends ivara is stuck with quassus heavy attack animation or regular attack animation, unable to attack or shoot even though weapons appear in the UI as changing (the attack animation with quassus remains). Movement and parkour is awkward to see, as even with bullet jumping, the attack animation remains during the jump.

[HRW33544]

I've experienced this issue on Wisp, with just doing heavy attacks it broke the animation like you just described, I think it's the heavy attack that's causing problems, I've also experience similar problem on Pennant's heavy attack, which stuck you in the first frame of it's heavy attack animation, but in this case, it will return to normal after open menu, which is different from Quassus.

Update: 

Just found out that if you press mouse left, it will start launching knives when stuck in heavy attack loop

[Konkrissu]

Update: broke with volt as well, don't know how this happens, only way I could replicate it was with ivara

[HRW33544]

This can happen to any warframe I guess, happens on valkyr and mirage as well, I think it's more likely to occur when spamming heavy attack at high melee speed and heavy attack speed.