He is fairly easy imo. You just have to find a good route/path to follow and repeat running around. Even on crushing, he is not really any problem. He is a bit faster and a bit more aggressive, but you wouldn't need to use grenades or anything besides the M4/AK. Just shoot the blue resin and try to do it with blindfire in some cases. If you find the route to follow, beating Lazzie is like taking candy from a baby ^^