"Stop that. No bombs!"

Way to get Roland to enter the fray. He has a better idea to save them time, before the crazy guy a few meters away starts entertaining wilder ways to do the job. He picks up a pebble close to his foot and makes a show of gripping it inside his left fist to Inigo. Then, puts both hands behind him, away from sight, and presents Inigo with both his fists closed.

"If you guess where it is, you get the rocks to clear out. Ready? Go."