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Speed Stacking
From what I've tested, the speed bonus from this subskill stacks with:
March Song
Fleet Feet
Shylock's Steps
I haven't tested Movement Speed Potions, but I have been able to see that pets that get affected by your Shield of Trust get their movement speeds boosted.
It's quite a sight seeing a Nimbus pooting along under the affects of March Song AND Guarded Footsteps.
Also, the duration of the movement speed boost is the same as SoT's defense buff, and not just for as long as the status symbol/knockdown immunity lasts.