A minute later they try again. "Menangis," whispers Adie. Again, the attackers are jerked backwards. They weep openly until Adie waves off his force field.
Another attempt, which Adie thwarts with one word: "Tertawa!" This time, his hapless attackers double over in laughter. Adie nods sagely, and the tittering stops.
What would happen if a bapak tried to use his invisible shield to stop an oncoming truck?
"That's easy," says Adie. "He would die."
As every cartographer knows, you've got to draw the line somewhere.