Grey Talon invincibility

[thor.asgards.son]

Grey talon is often invincible during his ultimate, which caused me to die in this example. This has occurred many times, for example also with affliction, Mo and Krill burrow and anything that is not a direct attack basically.
43787203 match ID 17:45

 

[Dead Man Dan]

I've had times where I cannot melee him during this state as well, you slide straight through him as if he's not there

 

[michal.1.dobosz]

just found this after i had an enemy sinclair steal my teammates grey talon ult, and then proceeded to take 0 dmg from my calico combo
25:24 match id:46134300