Hello - I don't think hot potato has anything to do with finishing chapter II. Haren Brogg in chapter I gives it to you, and if Coleman has been killed you can't finish it. [url="http://www.gamebanshee.com/thewitcher/walkthrough/hotpotato.php"]Hot Potato[/url]
The mysterious tower, though, has a lot of steps. Read the guide and see where you are stuck: [url="http://www.gamebanshee.com/thewitcher/walkthrough/amysterioustower.php"]The Mysterious Tower[/url]
Did you talk to Raymond Maarloeve? He'll agree to meet you at the tower, this is important to finish the chapter - hopefully you've figured out his secret by now.
What does your journal say you should do? If you've really placed all of the sephirot, then you should find Maarloeve at the tower.
SWC
Sir Edmund:"Should you obey the lord who asks you to put a village of innocents to the torch? Is that chivalrous? Is it noble?" Me:"It's a great way to get promoted, I know that much."
If the dwarven blacksmith won't help you, then you've probably gained favor with the Order and lost favor with the Scoiatel. Use the Order Blacksmith - he'll offer all the same services and goods for the same prices.