Mind Flay - Nooby question

[Terminal Lance]

Hi all! Fresh 90 here, my first priest!
Does Mind Flay get an extra tick between 15% and 16% Haste? In the tooltip, when my Haste was 15.X%, Mind Flay "deals 32,108 Shadow damage over 2.60 sec." At 16.X% Haste, Mind Flay "deals 44,848 Shadow damage over 2.57sec." I found it pretty hard to test in the dummy because of Shadowy Recall and other proccies, but the few times that I got a "clean" Mind Flay at 16% Haste, it didn't do "44,848", it did about 1500 damage more at 33,636 over 2.57sec.
Is this a tooltip bug or something? I haven't read anything about this, I know about reaching the first Haste threshold at 8000-something haste for an additional SW:P + DP tick, hadn't seen anything about getting X Haste for an additional MF tick.

Sorry for poor explanation, it's 4:14 am here. /yawn Thanks in advance for any answers!

[Vicarious]

Hi all! Fresh 90 here, my first priest!
Does Mind Flay get an extra tick between 15% and 16% Haste? In the tooltip, when my Haste was 15.X%, Mind Flay "deals 32,108 Shadow damage over 2.60 sec." At 16.X% Haste, Mind Flay "deals 44,848 Shadow damage over 2.57sec." I found it pretty hard to test in the dummy because of Shadowy Recall and other proccies, but the few times that I got a "clean" Mind Flay at 16% Haste, it didn't do "44,848", it did about 1500 damage more at 33,636 over 2.57sec.
Is this a tooltip bug or something? I haven't read anything about this, I know about reaching the first Haste threshold at 8000-something haste for an additional SW:P + DP tick, hadn't seen anything about getting X Haste for an additional MF tick.

Sorry for poor explanation, it's 4:14 am here. /yawn Thanks in advance for any answers!

Mind flay tacks on the last tick from a previously clipped mind flay that's what you're seeing, this allows you to clip mindflay and cheat the system to act like you have 0ms latency.