Deravan looked at the slab at a distance, thinking a bit for all this as well as the dust and the zombies. He though a bit as he looks at the group.
"If that dust affects dragons.. last thing we need is another dragon being affected... and never know... that thing could end up helping us find a cure anything. I would like us to try to get it, but the risk of being attacked here by those zombies..." he says, thinking a bit more right now. 
"I will fallow you guys lead on this, cause I am unsure if its such a good idea to try to go and get that slab. If we could have some kind of magic to bring the thing closer.. not sure i can use the wind from my blade to bring that slab closer... might be complicated to even do that." he then says, thinking a bit, looking at the dust. Why was the group not affected? Was it related to them being stronger? As in... having taken human like classes or such? It was something he though about and would need to think more.