Shirley had also reported Zanqua's actions, so Davis knew her decision to kill the transport ship's crew may have been ruthless but very important if they wanted to conceal their tracks.
He wouldn't normally approve of such a thing. After all, he had many ways to make a person forget, but that wouldn't be the case for others. Moreover, he was also at his wit's end.
He heard Mystic Diviners were closing into the Eternal Twilight Lower Realm as they were in nearby realms. If he didn't leave soon, then he would be tracked down sooner or later. They were getting desperate to get rid of him, and Mystic Diviners were sacrificing themselves in droves.