The fire golems tried to hit Jake with Fire Bullets and Fire Arrows, but Jake used Flash faster than they could aim and always escaped. After losing half of their numbers in a matter of seconds, they used their final card… they began to explode. That was one useful ability for mindless minions to have. They wouldn't fear death, and thus they wouldn't hesitate. With a large number, they probably could wipe out a large army... the cost of summoning and wasting them was a problem, though.