2/Spam weapon swap while right clicking
3/Get stuck in the (lengthy) weapon draw+button spin animation. Impossible to switch out.
4/Once the animation is over, you are then able to switch again
When weapon switching without triggering the alt fire right away, it is still possible to weapon swap before the flamer is fully drawn out.
Not tested if this bug extends to other weapon with alt fires.
Probably flies bellow the radar as most have short animations though.