Ghost vs namor

It's registering that Namor's still attacking when you counter the medium attack and reflecting the damage. It's like Mighty Charge, where they stay unstoppable for a split second after the medium attack. If you hesitate a little bit you can counter his medium without it reflecting.

Eb0ny-O-M4w

You are basically intercepting him, which is interrupting his attack with your attack. If you delay it a bit, it will not count as an intercept and you willbe able to bypass it

simolaz

Do the “ghosting” on the second hit and you’re free to destroy him without taking damage.

Seraphion

Then how come she sometimes does damage and sometimes doesn’t

You need a good timing to not get damage back