Diary of a Programmer 14– the UX of Highlighting Text in a Google Doc on Mobile

first you hold your thumb on the screen to invoke highlighting mode. this creates a starting and ending anchor point or tabs or handles or whatever you want to call them that you can grab onto. where would you go from there? would you grab one and move your thumb toward the top of the screen, expecting the document to scroll up and highlight the appearing text as motion of the text falls toward the bottom like blocks of tetris? or would you move your thumb up to the top text shown on the screen, then let go of the handle, then scroll up more on the screen using your thumb to swipe down, so that more unhighlighted text shows up on the screen, then grab the top handle and hold onto it with your thumb and move your thumb up to highlight more text and repeat this process until you've selected all the text you wanted to highlight in the document? which method would prove the higher and faster accuracy rate? which method makes you trust you could accurately highlight/select text in the doc without error while you are walking along the street attempting to send a poem in a Whatsapp message to your girlfriend while she visits her family with her husband in her childhood city of Budapest?