"Crooks was well within that range when he opened fire on Trump Saturday from about 135 meters (147 yards) from where Trump was speaking"
Still a long shot but not as bad as 400 yards. 400 yards with iron sights would be almost impossible. 147 would still be hard but not impossible with practice. Not that this dude has practice and a scope would be cheap and infinitely easier.
That's what I'm thinking. Even in flip flops you should notice the sand being hot and think, "maybe I shouldn't do this"