The goel ha'dam has either the right or obligation to kill someone who accidentally killed his/her(?) kinsman (Makkot 2:7) whom I will refer to as the refugee.
I would like to understand what parameters (if any) are included in this license. For example, if the Goel Ha'dam captures the refugee can he hold him imprisoned indefinitely before killing him? Does the Goel Ha'dam have license to torture the refugee to death?