Chan of course can't do anything to help that Ghost, it is considered rather clumsy to enter the Deadly Tree's suckage Radius even with all the acknowledged warnings spread by any Ghost in the surrounding area. If it was a Human having such a fate, Chan would have second thoughts about helping that Human instead of leaving him or her to parish. But how could he help a Ghost? He can't grab the Ghost's hand and he certainly doesn't wish to be possessed by the Ghost in order to save it. Because who could Guarantee that he wouldn't be dragged along with the Ghost? And who can Guarantee that the Ghost would leave his body after being escorted to safety?