Bad animation transition

Hello everyone, can you help me with transition at animator?
I have two animations (player spell to idle), player idle was created own avatar mask, spell animation was created with idle avatar mask. When i set transition at controller in Animator, spell animation plays correctly but transform to idle player "sits" on ground. At game when i call the spell animation .. spelling nt working but idle is working (like running, walking etc). Where is the problem please? thanks for help.