I usually notice this when I’m fighting Subject Alpha because I always end up dying when it happens.
When you swap between your weapon sets while dodging, two things can happen:
-You swap late and roll normally then keep attacking with your new weaponset
-You swap early and it cancels the whole dodge then you attack with your new weaponset (or you die if you were, for example, dodging one of Subject Alpha’s attack while switching to your ranged weapon)
I made a short video to show what happens, first time I swap late, then early.
http://youtu.be/2IMom3Xn5as