The phrase 'on higher stealth levels' you may also use the attack key is ambiguous. I understand that it has to do with breaking obfuscate, etc. but this is a very advanced concept and I don't think it can be succinctly stated at this point in the tutorial. Either the attack key or the use key work equally well for basic stealth kills, so I would recommend something to the effect of 'use either the use key OR the attack key to execute a stealth kill". Perhaps a special tutorial dialogue could occur for obfuscate clans?
