How would I go about permanently changing a character walk animation?

Say the default is the character walking. Then he gets hurt. How would I permanently change the walk animation to a limping walk animation?

Right now I have On collision with (Sprite) set animation to Walk2

But the Platform is moving set animation to Walk1 takes over

So if the player gets hit it blinks for a millisecond and then switches back to Walk1 animation

So how would I permanently switch the Walk1 animation to the Walk2 animation after hit?

Any help is appreciated

Use an instance variable to keep track of the state of the character, and set animations based on that variable.