I don’t think it’s likely that a Glatorian or Agori would attack Marendar. If one were to do so, Gelu being the most likely candidate, Marendar would probably get stuck before attempting to evade or disarm Gelu.
I’m pretty sure Marendar is able and willing to hurt other beings who prevent it from eliminating all remaining Toa though.
Might be a good time to remember that Marendar is based on the Sentinels from X-Men.