Shit sorry that doesn't make any sense at all. What i forgot to add was that it was the speed boost buff that proc'ed. Reliquary didn't make the book of ix always proc, but it always gave me the speed boost buff after 5:37 in game play. But the first time I noticed it, ix proced when I used the reliquary. Check the replay, and start watching from the 5 minute mark. Happens first around 5:35-5:37. The fact that I'm wearing boots and that I've previously activated them might have something to do with it, I'm not sure. But after the first instance, whether I'm wearing boots or not, the buff still procs when reliquary is used. I'll try and see if I can get it to fire again.
[update] yeah not really sure at all why it fired the way it did. Tried a new game and just kept spamming spells and boots, and nothing.