It's not some super technique, just a fall-back if you don't have a hash pipe. And you don't need knives (or buckets). Anything hot enough to smoke the hash. We used to just turn on the stove and drop a few crumbs on a burner ring, then crowd around sucking the smoke up with straws or ballpoint pen barrels...may the best hoover win.
(That's an electric stove, by the way...don't any of you bentbrains try it on a gas stove then blame me)