I know it has been a while since I posted anything, I had a really hard time trying implementing the counter action feature. Fortunately, I think I'm almost there, and know it just needs a couple of animation and a bit more love on the camera movement and it should be alright.
The counter actions can be triggered after a titan attack successfully dodged. You need to catch the right timing to do so, or else you might be grabbed by the titan, or just can't be in the right condition to start the counter. The idea behind it is to reward players who take risk and stay in attack range of the titan. A confident player can quickly titans, but he also takes more risk to be grabbed.