Before coming here, Hal and Melinda had weighed things and had decided that killing Cirk right now was short-sighted. Because just as Cirk himself had said, his father was bound not to just simply take his son's death in stride.
And that was with the strong brotherly bond Melinda had admitted to noting between the the Devon and Damien brotherly pair.
Also, Melinda had not been very sure as to how open her grandmother would be about the whole thing. True, she disliked Cirk and she was on Melinda's side. That did not change the fact that Cirk was still family.
In fact, while Hal could not really pinpoint where the feeling was coming from, he could sense that there was someone close to intervening and said person was surely strong enough to take their time and cut in at the last minute.
He did not need to go over to stop Melinda, but he preferred it this way.
It gave him the opportunity to look Cirk in the eyes...