“Would you like to let me in on this plan of yours?” The First Doctor spoke up, also worried that Eleven’s proposed explosion would be as much danger to his own self as it would the Daleks - not even considering his future self. 

Regardless, it seemed that the longer the thought simmered in the Daleks’ minds, the more hesitant they became. As they waited for the Doctor(s) to take further action, they seemed to slowly inch further and further backwards.