When an Asuran engineer is using flamethrower, being hit and triggering the flinch animation will cause the flames to veer off to the right. This isn’t just cosmetic: it will stop ticking damage. Applies also to elixir gun’s fumigate (though less noticeable since it can’t be up as often) and offhand pistol’s flame shot. I’ve also seen it
Flinch animations for other races (or at least the Norn) do not appear to impact weapon positioning.