Do the two paragraphs describe separate abilities, or are they cojoined? Does the second paragraph apply to all melee attacks all the time, or the only the ones made while the first paragraph's effect is active?
While wielding a melee weapon and holding cloth or other flexible object that’s at least 10 feet long, you can spend 1 Investiture as to increase the weapon’s reach by 10 feet until the end of your next turn.
Additionally, after you hit a character with a melee attack, you can spend 🔵 or 2 focus to use Tension on an object the target is holding or wearing, infusing Investiture as usual but without spending an action. You automatically succeed on the test to infuse it. — p.233