I just realised something in the 1997s Mummy
(Not because I'm writing that at the moment, nah)
When the Medjai first attack the camps in Hamunaptra, Jonathan is sitting at the side and shooting, later joined by Benni.
Then they hear a rider behind them and they run for their lives.
Jonathan is chased by the rider, who has a sword and calls for Rick, who tackles the men from the horse and we can see, that it's Ardeth.
Ardeth was full on ready to kill Jonathan...
I wonder if they ever discussed that situation later on, offscreen. Ardeth doesn't looks like the type who doesn't apologizes for his wrong doings...
Just a thought