If there are enemies around. Obviously take the heavy, but if there aren't, just wait the 2 seconds it will take for the rest of the team to get there. I've, on multiple occasions, watched a single blueberry grab the heavy when the other 4-5 of us are almost to it. And on those occasions, I will often follow said blueberry around and attempt to body check his rockets.... Yep. I'm spiteful. Dgaf.