Improbable. Our cast times in SB in af3 are 2.91 for most spells including foul.

B3 (12s of ui 3) -tick of 62% (11.5-9s on late tick) = 9597 mp - T3-cast of 2.91 (ui time left 9.09- 6.09 ) cost of 1920 mp = 7677 (mp trans .5s) 20% of 7677 is 1535 mp to rdm. Remaining mp = 6142 + 62% = mp full.

Remaining time (9.04-6.04 at best 0 human error or delay) B4 cast of 2.91 and 1200 mp leaves 6.13s - 3.13s left to cast foul and fast fire 3. If you cast foul youll be 2.91 behind the timer and lose enochian and ui3 resulting in a hard casted F3 or swift casted f3 and lose 2s on af3