Howdy!!
From the picture and instructions, where would you probe your one hit? What does "behind" mean to you? You going to probe the yellow or red circle??
simply put, no other instructions, Yellow, proceed with caution, Red means stop, but to protect yourself, take a hit from each one and report and treat them separate. but behind? could be the other side. good luck
simply put, no other instructions, Yellow, proceed with caution, Red means stop, but to protect yourself, take a hit from each one and report and treat them separate. but behind? could be the other side. good luck