I've never heard of this guy before; was quite an interesting video to watch. I was a bit curious about the group dynamics of how they all left at exactly the same time, so I looked them up. Seems he was unlucky enough to get matched up with two duos. I'm not saying it excuses their behavior, because it doesn't, but it does tend to explain a bit why and how they snowballed jumping onto him so quickly. (Hecarim and Tahm were together, Katarina and Tristana were together) And when people are together, quite often they do tend to come to the aid of their friends at any perceived insult or injury, whether it's a verbal slight, or some action in the game that is construed as causing a hardship.
In that case, Disco actually did the PERFECT thing. Which was say absolutely nothing. First rule of the internet. Don't feed the trolls. And he didn't. When the Tahm ate him and spit him into the Irelia, as a support main, I know what the Tahm's intention was. It was to get him away from any further damage from the Shaco box. Not sure what rank Disco is on his main, or if this is it, but these other guys are Silver. Tahm probably never saw the Irelia coming, and I'm sure he meant well, but it would have pissed me off just as much as it did Disco to be tossed into my death! But he really handled it brilliantly. He kept it to himself (and his stream) and did not type anything impolite, did not say anything even remotely snippy to his team.
This is one of those situations that you may see some of us mention when someone asks "what am I supposed to do when my team is flaming me?!" And those of us who comment frequently on this section of the boards will often tell them "Nothing. Say nothing. If you don't trust yourself to say nothing, mute them so you don't see it." Obviously, Disco has the ability to keep from saying something in response to what he sees. Not all players have that level of restraint yet. And that's not a "bad" thing; it doesn't mean a person is weak-willed, or anything like that. They may just not have as much experience with that sort of situation. But what he did on stream, is the sort of thing we try to encourage players to do. Because by saying nothing, even if they all reported him... those reports will be thrown out. He didn't do anything wrong. There is literally nothing in the logs to back up any sort of negative behavior, griefing, harassment or toxicity. And with him having a decent build, good cs, and 4 out of 11 kill participation, it's extremely unlikely that any reports for "trolling" would stick. Those reports are already difficult enough to prove in the case of actual trolls.