Guild Wars 2

Is there a cooldown on the 1s burn on the 6th piece of this runeset?
I want to use this set with Mimic blocking on my mesmer but if it has a cooldown it doesn’t really have a purpose for this setup

There seems to be no cooldown on the burn proc.

However I believe mimic reflects and does not block.

After you absorb a projectile (you take the hit), it reflects ranged and blocks everything else for the remainder of the channel.

The Retaliation on Block trait works nicely with it