Harry took a moment to let that sink in. Fleur's Veela fire was now cursed fire, and neither of them seemed to be losing any sleep over what they did. I meant to stop the next Dark Lord, but instead I have made a de-facto death squad. Of course, he knew Snape and Fleur would point out the deaths of these few evil wizards was preventing a new war from breaking out, and remembering how he failed at using the Cruciatus Curse on Bellatrix and knowing that she was on the run, he really couldn't blame them. And that was what scared him the most.