I didn't watch the full video.
I couldn't. Like most other reporters covering James Foley's death, I was anxious I'd stumble across some screen shots or a website where it'd auto-play.
You can't unsee a beheading.
In the 1970s, the Vietcong designed mantraps with sharpened bamboo spikes to maim American GIs as they prowled the Asian jungle. The idea wasn't to kill many soldiers but to instil terror in the ranks. Men would see a buddy go down in shockingly gruesome circumstances then relay details of his death to the rest of their platoon.
But war in the information age means we don't rely on soldiers' chatter to establish the enemy's barbarism. YouTube does the trick. The imagery of those first few minutes - a man kneeling and accepting an appalling fate, wishing his family goodbye - will do more to affect most of us than a conventional attack on a dozen men.