I used to do the same mistake when I bound my familiars to f4. Basically the moral of the story is, if you use f4 as a hotkey, only use it for buffs and not active skills

Cool pb by the way. That merc saved you a minute by punishering baal twice, but in general 16mins for a5 is really great pace. You got a nice low-density throne and that level tends to be the hardest part of the run.