"I apologize for the ash storm, but I think it better than actual attack by crossbow-men," Vershab says over the Message spell as he looks about the scene. Addressing Natala, he adds, "Agreed, but I do not know that spell - hindsight, and all that..."
Seeing that he cannot do anymore for the moment he pulls a scroll out of his case and flies towards the next leg of the race. Once there he looks about closely for a moment before turning back to focus on the chariots leaving the ash storm. Once the Blue/Green chariot exits he follows its likely path, planning the placement of his next spell.
Spoiler: Mechanics
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Move further along the race path and try to identify ideal locations to hinder the Blue/Green chariot enough to get our team in the lead. Perception checks - (1d20+18)[24], (1d20+18)[32], (1d20+18)[32]