Henein has used some of the complainants' subsequent words to cast doubt on the precise reactions they claimed to have against Ghomeshi (ie., challenging LCD as to why she wrote to Ghomeshi after the alleged incident that "your hands are magic".)
But by far the more serious aspect is using their failure to reveal the subsequent contact when asked by police (and, presumably, the Crown), to challenge their credibility as a whole. It's the last minute disclosure (literally DURING the trial) that has been the most damaging.