Smoke Bomb [SKAVEN]

An Assassin equipped with these bombs uses them to create a diversion and disappear in a puff of smoke when things are starting to look bad in a fight.
If the Assassin is fighting on his own (ie, he is not inside a unit and not part of a multiple combat) and has to flee from a close combat, enemy units have to roll 4+ on a D6 to be able to pursue him. Note that the Assassin cannot choose not to use the bombs.