"Whenever a creature attempts to use a teleportation effect or summon a creature within 30 feet of you, you may attempt to block the effect. Make an opposed caster level check (1d20 + caster level) as an immediate action. If the check succeeds, the spell or effect fails and is wasted; otherwise, it is unaffected. "
Is this saying that you can block an incoming teleport originating from outside of 30ft?
