Sorry OP, I think you are looking for a straight yes or no answer, but life isn’t like that, except when someone actually commits violence.
Despite what some people think, words aren’t violence.
Most staff handbooks will cover this sort of behavioural issue and the consequences. So you start there.
As it’s stands now it would be down to the investigating managers, and depending on what they find, and yes there can be mitigations, and indeed some protections for those who appear to cross certain lines. And ultimately a decision will be taken.
If you are unhappy with the outcome, then I’d ask you why? It seems you think the appalling behaviour should lose the person their job. That’s not your right to make happen. Independent mgmt will investigate and arbitrate.
However, you do have further recourse. I don’t wish to out words into your mouth, but has the person been relocated away from you, done anything since, provided an apology, created a hostile environment where you don’t feel safe. If so, then if you are within your rights to speak with HR about these issues to see if some additional support can be put in place for you, or in the event say, that the person who did the abuse, has been giving you the eye, or muttered something out of earshot that ‘they are going to get you’ or that other staff are treating you differently now, and seem to have sided with the abuser, and thus you no longer feel safe, etc etc. of course, you could make all this up, but it would be a vindictive evil person who lied to get someone sacked.
The role of management sometimes is to navigate the difficult waters of staff who do not get on, and find a way to allow people to come to work and just do their work. If the abuser has shown remorse, been appropriately dealt with, let it go would be my advice. On the face of it, it looks like two strong individuals facing each other down, to me, and subject to knowledge of their prior relationship, or other mitigating factors, I’d say written (possibly final as it was in front of customers) warning worthy.