Sprint going to an end

We have a very good chance to reach all our goals this sprint. Actually, we've been close for almost two weeks now. But the problem is that we haven't reached one of the goals. The problem is that when people finish their tasks they get relaxed. Look like we're going to make it! And shoot at less important tasks. And the guy stuck on the important not finished task works like h*ll. I don't know if he's asking for help in a desperate way, but I'm getting desperate on his behalf. So, tomorrow Evil Anna will enter the room on his, and the sprint objective's behalf. Slacking is for slack time, not sprint time. And it's only time for slacking if everyone else believe it's time for slacking.