Less
Whether you really have respect for R Shach has yet to be demonstrated. However, it seems you must have left a Sefer or two open at some point if you doesn’t know who the ש״ך is. The שפתי כהן is one of the classic נושא כלים that we pasken from.
And no one said forget “all” ones learning, rather it causes one to forget his learning. Any amount of it. Which it is אסור to do intentionally and the psak is that you cannot do action which can cause it.