The first rank adds a Morale Bubble to Shake Free. The second rank increases the potency of the bubble.

If support: Shake Free applies its benefits to your marked ally. 

Rank 1

In addition to breaking out of all combat states, Shake Free grants:

Applies a damage preventing bubble grating 507 temporary Morale.

Duration: 10s

Rank 2

Shake Free will now apply its effects to your Mark of Grimbeorn target

+30% Bubble Potency