[GAMEPLAY] Spell shield activates the Mastery : Fearless.

It first happen while playing Sivir ADC against Morgan Supp. When I manage to block her Dark binding Q with my Spell shield E, my mastery pops up and goes on to cool down.

I know that's how the mechanic works so that the initial damage i take get's reduced by the mastery, however i hope that it's a bug because not rewarding me for spell shielding and taking the mastery way on to cool down feels dull for what it is worth.

Note: i tried it with Banshee's Veil and Edge of Night and the same "bug" occurred.