Unfortunately that strategy only works if you suspect you’re about to be obliviated. Which makes it mostly ineffective except against people who play fair and ask before mucking with your memories.
Or people like canon!Lockhart, who bragged but didn’t ask, though that might be a petty distinction.
Or like it was first revealed in chapter 6, as stated above, or again in chapter 17, when one is in a situation wherein there’s a high likelihood of Obliviation. Honestly, unless someone springs out and sneak-attack Obliviates you, you’d probably have an inkling that someone trying to keep their secrets is either about to kill or Obliviate you, which should be enough time to chew your cheek or lip.
Unfortunately that strategy only works if you suspect you’re about to be obliviated. Which makes it mostly ineffective except against people who play fair and ask before mucking with your memories.
Or people like canon!Lockhart, who bragged but didn’t ask, though that might be a petty distinction.
Or like it was first revealed in chapter 6, as stated above, or again in chapter 17, when one is in a situation wherein there’s a high likelihood of Obliviation. Honestly, unless someone springs out and sneak-attack Obliviates you, you’d probably have an inkling that someone trying to keep their secrets is either about to kill or Obliviate you, which should be enough time to chew your cheek or lip.