If noobs (who presumably can't/ won't learn to use points) are incap upstairs at that spot...then they are basically dead, even more so with a tank up there. at that point, you might as well run as other infected players are going to be able to farm tank points off the incaps up top. even if the players that dropped kill the first two tanks there will probably be more. at this point all the regular SI can now focus the people on the bottom since the noobies are dead...and then gr.
i can't speak about the exact situation that occurred but i've been in enough situations like that where i just tell the last few people with me that its basically now escort the mains as far as we can time.
anyways, really sad to see you go drag, i remember getting excited when you first joined (on death toll i think) because you were the best player to join in a long while.