What he means is that after casting a spell, you can't cast anything again for like two seconds, but you can immediately click an item with a clicky ability. This effectively means that using JBB right after casting a spell shaves a couple of seconds off the cast time, making it an efficient use of time. Clicking it again then negates this advantage because you could have immediately cast a spell instead which is usually more worthwhile. So you could cast a DoT, click JBB, then cast another DoT without having to spend any time at all waiting, but clicking JBB twice in a row isn't efficient because the second time won't gain you anything as you could have cast a spell instead without waiting. JBB was useful for that kind of thing, but not for chain-clicking, because you would get the same (or more) DPS and efficiency out of just casting your spells and using canni/torpor to negate the mana cost.
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