I just got my hands on a Spine so I've only been reading on forums before how great it supposedly is, especially with Trail of Light to trigger it twice. But when actually playing with it, doesn't Trail make it worse? The only time you get a bonus from Trail in regards to the trinket is if you're only casting FH once every 6th second so the buff appears on two targets that previously didn't have it. But most of the time we're casting it much more often with resuslts in 1 new target receiving the buff (same without Trail), but the buff on your previous target is refreshed which results in you not getting that mana back.
Have I misinterpreted people in regards to Trail and Spine being good together or what am I missing here?