Right now, I'm in chapter 65 of RoW, and there is something that it's bugging me A LOT. Let's briefly describe the situation:
A- The fused have conquered Urithiru. By doing so, they have incapacitated most of the radiants and fabrials.
B- Dalinar suspects that something goes wrong in Urithiru, so he sends some Windrunners to watch the tower. Obviously, these Windrunners cannot get close to the tower without getting affected by the tower's defenses, so they cannot physically enter the tower to check if everything is okay.
So, given A and B, wouldn't the most logical solution be to bring some non-radiant person with the Windrunners, leave him/her near Urithiru, and then make him/her go to physically check if everything is okay by foot?