Once you've mastered the skill of blackjack, you'll learn how to utilize it. Blackjacking is the process of knocking your opponent out to steal his money (twice) and then repeating the procedure to gain knowledge. To put it in simple terms you must right-click your opponent for the knockout , and then right click to pickpocket him twice when he's unconscious.
Since in OSRS the bandits are only dazed for 3 seconds, you must grab them as quickly as you can. Failure to grab them twice in time will result in being taken into custody. This means a 5 seconds of stun and the damage you've done. Sometimes, bandits are also inclined to seek revenge on you. This will result in a message from the bandits "im going to kill you because of that" and then eventually they attack you. It is possible to avoid this by taking the right actions.
If a bandit says words that are that are mentioned above, all you need to do is attempt another knockout. Because the time between the message and attack is extremely short, another knockout must be attempted right following the text. If you are able to knock your opponent unconscious you must use the pickpocket twice whenever you can. Repeat this procedure until you have gained the experience.
Elite Clue Scrolls - Things become more complex when it comes to Clue Scrolls of this tier. Most efficient methods to harvest these scrolls is Barrows. Barrows is a profitable minigame as a whole, so should you decide to mine Clue Scrolls there, you will earn some extra money before even starting Treasure Trail. It is possible to have around 33% of the chance win a scroll when you defeat the six Barrows brothers.