Rule 801.7

A triggered ability doesn’t trigger unless its trigger event happens entirely within the range of influence of its source’s controller. Example: In a game in which all players have range of influence 1, Alex is seated to the left of Rob. Rob controls two Auras attached to Alex’s Runeclaw Bear: One with the trigger condition “Whenever enchanted creature becomes blocked,” and one with the trigger condition “Whenever enchanted creature becomes blocked by a creature.” Alex’s Runeclaw Bear attacks the player to Alex’s left and becomes blocked. The ability of Rob’s first Aura triggers because the entire event (Runeclaw Bear becomes blocked) happens within Rob’s range of influence. The ability of Rob’s second Aura doesn’t trigger, however, because that event includes the blocking creature, which is out of Rob’s range.