Remember that the airport is at 3,555 feet, so 7,000 feet is only 3,500 AGL (above ground level). I don't know anything about these drones but apparently they can fly at 3,500 AGL.
As far as how close he was to the airport, they're about 11 miles to touchdown at that point, heading NE bound abeam those twin stack things just north of Stoney Trail, getting ready to swing east and then south to land southbound. Worse, they were flying a specific approach that doesn't allow deviations so evasive action to avoid a drone means bailing on the approach.
Could one of these bring a plane down... most likely scenario is that you lose whatever engine that thing gets sucked into and you're calling mayday to get down ASAP. God help the sorry son of a bitch whoever causes that, if they find him.
Hit one in a single engine plane in the right spot? Better hope there's some soft grass or a road to put her down on.
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