The modification of not being able to enter CE after you get damage is mainly protecting Police sides having a fair fight and preform a proper response to those Hit and Run outside CEs. Before that was implemented, Polices are often being engaged but unable to protect themselves from further attacks or performing an arrest due to criminals evading the arrest by entering CEs. In before the situation become eased, I am voting Downvote to this suggestion. Also, I would like to point out that. There is no what you call "Fair" situation in between CnR.. In this case, I cannot see why would criminals side would like to gain more advantage even tho they're in upper hand already.