At first he said "Oh you step on a landmine."
Then I pointed out perception rolls, and he said "But of course to spot it visually you'd need to roll crazy high."
So I look over my sheet and I have SURGED for electrosense, so I asked if I could use that, he let me at -4 because my observe in detail was on something else at that round. I rolled for it, spent an edge, and ended up with 6 hits.