Assigning different animations for multiple button stances

Hi, I need to assign three different animations for the running animation. Basically on key down one animation, on hey hold another (which loops as much as the key is being held) and on key up(release) another animation. I'm having a model of a spherical guy with legs who rolls on the ground when you press Shift. I was just wondering whether it is complicated or not.

If it is, can someone please tell me why when i finish doing the roll animation in the middle on the process it goes from that

into that

and it stays like that.

Plus if I use animation controller for animating, my textured do things like that funny thing is that it happens only if i use transition from idle to walk animation, if i do it otherwise - everything is perfect...

Gosh why so many problems with this unity. Ikr i just have started from a scratch but still, thanking everyone in advance!