They kill Banquo, but Fleance gets away. ... He is happy to see them there but will be upset to hear Fleance is still alive.
Banquo and Fleance approach on their horses and dismount. They light a torch, and the murderers set upon them. The murderers kill Banquo, who dies urging his son to flee and to avenge his death. One of the murderers extinguishes the torch, and in the darkness Fleance escapes.