My male and female fought suddenly, a bit shocked now

Hi,

I'm basically trying to understand if my dogs were completely "serious" in their fight or just showing off.

So my dogs had a fight over a bone very suddenly (they had their own ones but they wanted the same one), they have never fought before so I was quite shocked. The other one is male and a good 10 kg heavier than the female, so I'm kind of concerned why he even wanted to fight. He's a lot stronger and I'm sure they both know that, plus males and females very rarely fight, so I was completely taken by surprise. They both love their treats, but have never been resource guarders.

I'm trying to convince myself that they weren't completely serious since they stopped when I yelled, and in any serious situation I'm sure the male one could "win" instantly. They were standing on their hind legs and growling. No biting. Can anyone assure me they wouldn't have fought till serious injury please? I'm super stressed out now 🙁 I don't want them to see each other as a threat.