10% and 7% are within the normal margin of error for polls. You can't read anything at all into short term movements like that, and you certainly can't assign them to particular events like that. Also, remember that voters impression of an interview or debate are heavily coloured by their pre-existing views. You may feel that it was a car crash for the Greens but that doesn't mean that people inclined to vote Green did.
Try telling that DP that and he'll jump down your throat with super amazing stats that will predict the future 100% accuracy
On a serious note 3% is not a big deal when you're the cons or lab, but that's a 3rd of your voting power when you're only at 10% to begin with