@trickshot121 MC didn't have his guard dropped, and he already as @Romariel said, they already mentioned the killing intent, so even if plot armor at least it was well done. (she also didn't gave a F about him, so she got the opportunity to kill him)
@trickshot121 cause these villains he fought are swordsmen, not assassin
they were all perverts who get off from fighting strong people, they want good fight more than clearing their mission
@jwkinraleigh they "have" to, they take pride over their strength so flexing your abilities and beating your enemies who learned how your ability work is how they roll
the mc is the same, he also flex and explain the trick over his sword