Eden-DAoC

Question, when it comes to RR5 abilities like in my case desperate bowman that has a stun effect that is listed as un-resistible. How does that work vs RR abilities that also listed as un-stunnable like charge or MoC? I recently had ran into two situations where my RR5 stun had no effect on a charging enemy or on a MoC enemy. I was not sure if a RR5 supersedes standard RR abilities when it comes to the effect since some RR5 like mine disables the caster of the RR5. I tried looking around online but no luck finding an answer on that. Not sure if this is correct behavior or if anyone else's RR5 had issues like this.