Grace obviously wanted to put things to rest and didn't want to let Lucas get into a conflict with Gisele.
Although Lucas understood her intentions, he didn't intend to let Gisele off according to her wishes.
"No, it's not the first time this woman has come looking for trouble with me. If I let her off this time, she won't learn her lesson! If you're worried that I will offend the Taylors because of this, that's unnecessary. A mere Taylor family doesn't mean anything to me," Lucas said firmly.
Grace immediately recalled that when Lucas had helped her deal with Liam Wallace pestering her, he seemed to have also said that the Wallaces meant nothing to him.
In the end, Liam died. But Lucas was still well and alive, without having to face the revenge of the Wallaces.