Jarvan "Free Smite" - [Gameplay]

I have noticed that on twisted treeline, I can get a "free" at the first camp. I play and start at golems. As soon as the golems spawn (1:40), I drop the flag followed immediately by (like I roll my finger off of both keys almost at the same time). When I do this combo, I get a 15 second cooldown on (so I have 1 charge.) When I the camp immediately then drop the flag, I get around a 60 second cooldown (no charge on .) I don't know if this is a bug or intentional. I didn't really want to tell you guys selfishly as it makes the first clear simpler. Let me know if what I said doesn't make sense, I could try to think of another way to explain it, or take a video.

P.S. My starting items are: and I have altered both my runes and masteries while achieving the same effect.