Just show them a video or do a video game simulation, no need to actually be on the mission then.Actually, I think it does work well: "See, this is how we do this -- if we'd gone around the other way, they'd have been able to spot us. This kind of cover is a godsend if you're trying to ambush a bunch of Advent. If this was an actual combat mission, we'd open up by throwing a flashbang right in the middle of them, then mow them down while they're disoriented."