That was on the same roof (so in engage range), and basically a sniper's nest. And the position i chose was in sight for the ninja. So had i used an order to reveal my Mk.2, the ninja would have engaged. I had only around 1/3 chances to disable the ninja. I would have just wasted orders for nothing. Better consider it a loss and focus on something else. I guess (don't quite remember) i just smoked my way to the objectives with good old Machaon. No need to force an unfavorable situation.