Maxperson
Morkus from Orkus
Yes. It's the beginning of the spell effect, which is according to you interruptible even though it's an instantaneous effect. Dispel magic should be able to affect it with the exact same timing. There's no reason, if your interpretation of Ready and Triggers are correct, for Dispel not to work as a reaction.First, no, the disappearance is not the beginning of a spell being cast. Do we agree on this ?
Try and explain to me how you can interrupt a teleport in mid effect to walk quickly 30 feet, taking far longer than a readied Dispel Magic(since all you do is release the magic), but the spell is too quick for a Dispel Magic to take effect because teleport is instantaneous.