Furthermore, it looks to me as if the two shooters were found in a creek on the woods side of the house - not the lake side of the house. If so, and if my theory about a lake escape is sound, it would mean that after having executed the hitmen, the third shooter would then have had to cross back over the "hottest" area of the compound to get to the lake - at which point the entire area would already be crawling with armed men and guard dogs. Again, not an easy feat.