I thought you couldn't /remake if someone got first blood

I think the rule is that you can't /remake if someone left after the first blood. This is to prevent abuse of the system by, if first blood is given up in a jungle invade early, for example, the team who got first-blooded on can't simply have one person leave the game and the rest of them get out of the game without penalty. If the individual never loaded in or DCs before first blood, it doesn't affect the ability to /remake.

Edit: Here's the description of how /remake works. The important part for this discussion is the second bullet point, which reads "A first blood against a player’s team before they leave/dc prevents a remake vote". Basically, if first blood is scored against a team and then a member of that team DCs, they don't get to /remake, but if someone DCs before that/never enters the game, their team still gets a /remake. This feature is in place to prevent gaming of the system, as I noted above, not to prevent teams from remaking just because their 4 v 5 disadvantage got one of them killed.

Someone disconnected before the 3 minute mark with or without first blood, the remake will work.

You have until 3:00 to kill. There's probably also leeway favoring the team with the AFK