Supreme Skirmisher's Bow's Encounter power reads
Power (Encounter): Free Action. Trigger: You make a ranged basic attack using this weapon. Effect: You make a ranged at will attack using this weapon instead
Now Clever Shot reads
At-Will * Martial
Standard Action Personal
Effect: You make a ranged basic attack with a weapon. If the attack hits, the target is also subject to one of the following effects of your choice....
Would it be legal to, upon being granted the ranged basic attack from Clever Shot, to use the Bow's encounter power to use Twin Strike instead? And if so, can I apply the slide, prone, or slowed effects of Clever Shot twice to a single target if I hit it with both attacks from Twin-Strike, or two targets if I target two? So for example could I use this combo to slide a creature twice, or slide it then knock it prone, or knock prone two different creatures, or slide two different creatures?