Walk behind him, and RuneScape gold assault or pickpocket him. He has 20hp, so attempt to make a fast kill, or if you have a good thieving (60+) Pickpocket him. He'll drop/receive a Guard helmet. This merchandise is vital. Place it on, and take all of your additional armor except your weapon off. Exit the room, with run away, in the hallway. Walk past any guards to the last room, in the end of the hallway. When no guards are confronting you, place on your armor and open the doorway. The hostage-taker will attack you with range and melee.
He's level 108 with 450HP, making it a small challenge to kill. Throughout the struggle, guards may enter the space and attack you. There's a high chance he will muster a High Guard (level-75) to mage you with a rather strong Wind Wave. When he is dead, speak to the Hostage, and climb out the window and then run to the exit, with numerous level 35's which range you. There can, at times, be around 20 guards attacking you, so be cautious and quick.
Get everybody set up. Sneaker(s), run to the drop in the same style, but it'll be different. Blocking the drop will be a Hostage Guard, which you'll have to smoke or shoot. Tell the ranger and magician what letter it's, and also the ranger and magician must decide who will damage the guard. When the shield is dead/stunned, walk past it and move around high floor. The only problem is, there is a protector by the window you're likely to shoot , so inform the Ranger and Magician what letter the guard is, and they'll decide who will strike.
Chances are that the protector will be from the Ranger's range, but it might walk by a window in which the ranger can wound it. So just have the magician smoke it, then immediately create a zipline, and walk in the room with the shield from the window. Now walk over to the Hostage's Room. Quickly enter, and you/the two of you can begin attacking. But now, the Hostage Taker is level 194, with 600HP.
But the reason he has obtained a reasonably large stat increase is the Magician and Ranger can help you. The enemy is obviously inside the Ranger's wounding range, but never withing killing array. A"wound" may perform up to 14 harm, and should the magician smokes it, it may do up to 5. Kill it, save the hostage and take exactly the exact same process to run to buy osrs fire cape the tent. You will all receive the same reward.