does SCH gets better aoe heals at higher level?

[Rawrz]

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

Most of the time if you did it right, this is what should happen:
Boss casts high damage aoe
Precast medica
Boss aoe goes off
Medica cast goes off .1 seconds later and goes off even if you're hit with enough to interrupt