R2-D2 AND C-3PO ALLY PACK
Q: Can “Single Purpose” be used to perform a special action twice if that action includes an attack?
A: No
Would this FAQ entry keep a figure that was also benefiting from Assault from using the same special action twice that includes an attack? I'm not sure if such a combo is possible currently, but if a Trooper had a special attack action playing this card and being within 3 spaces of Fenn should let them attack twice and use the same special action twice.