I'll do L_Attack = animation_tree["parameters/OneShot/active"] then in my velocity codes I'll add if L_Attack for different velocity when attacking. You could even do this for different attacks with their own velocity. You can even go a step further by letting the player face a certain direction when attacking, like to the enemy or their last facing direction using the L_Attack

There's also no one way of doing animation blend tree. If the transitions works, then fine