This occurred to me today. Assume you have:
Garven + R5-P9
Kyle + Moldy Crow
Given the precedent of being able to spend focus tokens on rolls with no [focus] results, do you think Garven can spend his focus via R5-P9 at the end of the initial Combat Phases (before the enemy is close enough to shoot)? He cannot increase above his shield value of course, but the point is just to charge Kyle's focus banks.