If the show doesn't want the embarrassment of Bristol potentially making it into the finals again, over dancers who are clearly better than she is, some of whom have even won before, the judges need to get ruthless with her scores. She wasn't just 2.5 points worse than Gilles. The difference between those two dances was much greater than that.
Whew! Gilles is safe. But Helio is in jeopardy? How in the hell can that be? There's no way Helio's quickstep was worse than Bristol's. Not in anybody's universe.