The only thing I see wrong with abc's behavior is his outburst in the discord and the traitor bait in one of the videos above when he thought you were AFK. I can understand things can get heated sometimes in videogames, however TTT isn't as big of a competition gamemode as some people can make it out to be. Both of you claim this stuff happened over a period of a few hours which is pretty much one play session for most people. We classify grounds for harassment as someone going out of their way to intentionally irritate/target someone to get a rise or a reaction out of them. Abc's behavior in this report would not qualify as harassment or bullying, it is just simply frustration over a short period of time. If he went into your DMs or persistently contacted you in other forms just to continue to insult and confront you; that is harassment. Furthermore, saying "hang yourself" or "kill yourself" is not really a big deal given the above context, it's just the same as saying "fuck you" to someone on the opposite team in a videogame. People say stuff like that all the time to each other, what makes it not okay is when it is used in excess and constantly to the same person - if you are constantly messaging someone telling them to kill themselves in an unrelenting fashion; that is harassment, that is bullying, that will get you in trouble.
Moving on to the discord interaction, both sides are in the wrong here. The conversation should not have gone on for as long as it did, much like the interaction in-game. There are plenty of tools in place to cut off communication coming from someone on pretty much every means to do so. You could have blocked his chatter in-game from reaching you and offer no responses to whatever he was saying, Abc could have simply just got off when he started getting frustrated. I think it would be in both of your guys' interests to block each other through every means possible and be more aware of the state of your emotions and where they go when you are playing games, this will prevent future outbursts and overreactions.
Lastly, I will again say that both of you should block each other and avoid future interactions outside of the basic gameplay behind TTTRW. If either of you have any additional questions or comments you can DM me on discord at any time and I can elaborate on whatever is needed. I appreciate reports being made so that these situations can be brought to our attention and dealt with before they become even worse, I'm sorry you two had such a negative experience on the server. I can only suggest you guys work towards resolving your disputes in a more mature manner than threatening to make a report, making one, and then arguing about it on discord.
Side note: Currently, punishments are not up to the victim after a report is made (kept in-game). If someone breaks a rule or two, the punishments for those rules are what they will receive. If someone purposefully RDMs you, and you report them, and you keep it; they will be banned accordingly - not for less, not with a different punishment. Reports are not a tool for you to intimidate other people with, they are a serious forum for you to express your concern/knowledge of a broken rule/discomfort with other players that can result in punishment towards the reported individual - depending on what the report is for and what the individual is guilty of. I feel as though this needed some clarification since I've noticed people flaunting in-game and forum reports as a means to intimidate other players. If you report your friend and you keep the report (not by accident), they will be punished if guilty. Same if you report someone on the forums, you can't request a lesser punishment if they did something that warrants one.