Gamers can swap between active heroes at will, and can bring the friendly hero in to do bonus damage for a limited time. (adweek.com)
The last hit when a weapon breaks will also deal bonus damage. (eurogamer.net)
Ultimately, it's up to you whether you want to risk dealing less damage overall at a chance of bonus damage, or dealing more damage with a high risk of dealing less. (shacknews.com)