Party Wind Walk is a skill in the Bloody Song skill tree of the Archer class.

Skill Description: Increase your party members' moving speed for 30%. This skill can be used only when you're in a party.
Required job: Second Job
Required skill(s): Wind Walk
Required points: 30 points in Bloody Song
Is requirement for: Enhanced Party Wind Walk
Skill type: Support Skill
Weapon Required: Crossbow, Bow, Ballista
Attribute: none
Cool time: 5 seconds
MP Usage: 45 MP
Target: Party

Not simply for those long runs back after killing Hazard, this also helps tanks gather up mobs faster for AoEing and that THS warrior/HF mage run like hell when they manage to pull agro on everything.