in this video you can see one straightforward way of killing brother laz in version xvi without going to town. the trick is to use the entire map to stretch out the fight
i didnt kill death projector, but thats fine since the path i chose follows the spiral, so it usually (but not always ) doesnt cause any trouble. the main difficulty is getting the first purify to hit and keeping ow on. and it doesnt happen rarely that laz decides to spam totems instead of jumping. overall the fight can be done much better than in this example, i have one blooper video where laz was nearly dead after leaving the top left room, but unfortunately death projector splash dmg killed me, still a great fight, could have been main video: https://youtu.be/p8G2WDjVMYA