Unfortunately, Shield Bash and Sweep Attack are both single-strike, frontal-cone abilities (though Shield Bash has a rune that adds some chained aoe damage effects). These skills don’t have a ‘first three targets.’ They hit all targets at the same time. Which is why Drakon is worded the way it is. However, Roland’s underperforms by a sizable enough margin that the restriction on Drakon doesn’t make any sense.
Drakon’s Lesson: Sweep Attack and Shield Bash deal [300-400]% increased damage. This effect is doubled when only a single target is damaged.