If “The Biggest Loser” has taught us something besides how to lose weight in a healthy manner, it’s that karma is alive and well in every walk of life. A few years back, Vicky and Brady got what was coming to them by not winning the cash they coveted so badly, despite stepping on everyone’s collective toe to try and win. This season, it’s Lance and Melissa who are competitive to the point of being obnoxious, and it came back to bite them last night.