Chimney-sweeper

I like to meet a sweep—understand me—not a grown sweeper—old chimney-sweepers are by no means attractive—but one of those tender novices, blooming through their first nigritude, […]

He has been in all situations and occupations of life, according to his own account; a potboy at Hampstead, a shoeblack, a chimney-sweeper, an East India Director, a kennel-raker, a gold-finder, an oyster-woman, a Jew cast-clothesman, a police justice, a judge, a keeper of Newgate, and, as he styles it, 'His Majesty's law iron-monger for the home department:' […]

But what could Croatian chimney-sweeper Marko have been thinking by using a hand-grenade as a weight for his broom and then turning on his welding apparatus in the cleaning process?