You mean like what was teased (and then forgotten) with Guy and Hal, where Guy made enigmatic comments to Ganthet (I think) about their pact along the lines that when Hal found out about what (ever vague, undefined thing) they were planning at the time, that friendship would be over for good?
Heck, none of the GLs even seemed too willing to take long-term exception to Hal BEFORE Parallax was revealed to be a possessing entity. They'd fight him as the need arose, but otherwise they were all pretty darn forgiving.
Comment