I know what your saying but in regards to them not being able to speak, the rule isn't about being able to speak. It is saying you can't use your radio. When you are hit by a rubber bullet gun you aren't just hurt, you are knocked out and are unconcious for a couple of seconds whereas when you...
3H) Restraining & Zipties
If you have been restrained or Ziptied you are no longer able to use any communication to contact your friends or gang members, This includes: group chat/teamspeak/skype or any other way of communication.
Does this rule cover people who have been Tazed or Rubber...
I tend to agree with what you are saying and the simple solution I feel would be to Modify NLR so that you can't return to the scene after being killed even after 15mins, the whole situation in your case and many others would have no problems.