How to return to animation state?

basically i have a character when taking a certain number of hits it fires an animation state the problem is it doesnt transition back to first state it stays on the second state theres only two states how can i make it return to first state?

Click the transition between the two Animation States and check Bidirectional in the Details Tab. You also could drag from border (light grey) of the second to the first state to create such transition.

There you could specify a condition to do so.