Split Atium shadows are a probability but I doubt they'd miss the one that exploded because 1. Explosions are quite large and hard to miss no matter how faint. 2. the other mines not exploding wouldn't change the future for the one that does, so they wouldn't split, it'd be the same as just stepping on it/ not stepping on it. For the time delay explosion, that would actually be a good idea, but the speed of shrapnel is a bit irrelevant to a point, Atium also gives you enhanced mental abilities to deal with the information, so if it's possible to dodge, they'll still dodge it.