does SCH gets better aoe heals at higher level?

[Edvardelis]

Whm: damage is about to happen, precast cure II/Medica so that it goes off just after the attack. Great WHMs master this. This is for higher end/familiar content with scripted mechanics.

Can you get knocked out of casting? I suppose that might be a once-in-a-blue-moon case for {Surecast}.