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Message: <blockquote data-quote="Maxperson" data-source="post: 6911771" data-attributes="member: 23751">The page above the one you just quoted deals in casting times.  Counterspell, being a reaction literally takes a fraction of a second to cast, and yet even that is not fast enough to just stop a spell in between the cause and effect.  It has a failure rate.  There's no way a PC is going to swing a weapon, fire an arrow, or run out of the room in-between the finish of the components and when the spell effect takes place.  It takes longer than a fraction of a second to do those things, even when ready to do them.  If your trigger is the beginning of spell casting and you have to wait until that is complete, you aren't going to have time to do anything before he effect happens, since the effect happens as soon as the casting is done.  The effect doesn't wait for you to do your movement or attack before happening.</blockquote>