BT Šab 103a(10) :חזא אומנותא בשבתא וגמרה‏ : (if) one saw a skill (being performed) on the Sabbath, and he learned it
See the entire entry for ˀummānū, ˀummānūṯā n.f. trade, skill, craft

BT Šab 103a(10) :חזא אומנותא בשבתא וגמרה הכי נמי דמיחייב‏ : (if ) one saw a skill (being performed) on the Sabbath and learnt it, is he in this manner also guilty (of violating the Sabbath)?
See the entire entry for hāḵēn adv. so, thus