[Shikimori Kazuki]

Originally Posted by Village Idiot

Spoiler:

Shirou's Reality Marble is the power of Imaging, which is basically to create anything he can imagine, up to the limit of his willpower. (he normally Traces because making a copy of an object is easier than inventing something entirely new.).

Basically, Archer is telling Shirou, that since humans normally doesn't stand a chance against a Servant, that instead, he should imagine something using UBW that he can use to defeat his opponent.

Spoiler:

so we should expect to see something where Shirou uses his UBW on the stage against Gil perhaps =P. So, not only does Shirou will show his tracing talent but will use his UBW to kick some butty mun xP