Thea casts her spell and moves forward. She detects only the minds of a few simple animals such as lizards, bats and rats. No coherent intelligent thougt. About the time the group is getting really concerned that Wally might have left them or run into trouble he returns looking rather smug. "Right this way Constables. I've have seen your halfling. The little bugger is still alive and well." There seems to be a hint of disappointment in that last statement. Anyway, he begins to lead you deeper into the tunnel.