>>59421725 Shirou has always been using what everybody calls "imaging" or "imagination". Because that's exactly what tracing does. Tracing an imagination (a Reality Marble - yes, a Reality Marble - UBW isn't about imagination and images - all Reality Marbles run on that) unto the real world. It'd be much more accurate to say that Shirou's true power is his Reality Marble and that projection and reinforcement of weapons are applications of that.
The strength of the mental image determines how stable the projected item could last outside of UBW and its structural strength. This is exactly what Archer meant. But what's still being done is "tracing". In fact, it's still "trace on", even with Archer's incantations.
No matter what, only weapons that Archer and Shirou have seen directly and been recorded in UBW can be projected. Nothing else can be taken out.
The Japanese chants for both reinforcement and projection start with trace on (which is what is being said aloud as the yomigana) with the mental note that it's either going to be for reinforcement or projection (in kanji). Whenever touei is used by itself, it shouldn't be called tracing.
Touei is translated as Imaging by Eclippse apparently. Which isn't really wrong, but it's only leading to a major misunderstanding by some people about what Shirou's true ability is when combined with other translations.