set a trap: put one or two plants in the spot and set some nasty traps all around. what can they do? call the police? i dont think so. dig a pit and put some sharp sticks and rock in bottom, when they fall in most likely it will fuck um up real bad. if ur real nasty shit on the sticks, lol!
id laugh my tits off if i caught some thief like that and probably give him a good kicking as he trys to crawl away with two broken, gangerous legs!