Show him this pic and ask him if H3 still looks better:
http://files.bungie.org/misc/riceatron_ComparisonofElite.jpg
(I didn't make it, Riceatron did. I just thought it was cool, and rehosted it because it's friggin' HUGE.)
Watch this video:
http://www.youtube.com/watch?v=zy_YOks5ahA
The whole thing is pretty useful, but for this discussion, watch the section starting at 1:20 (first four shots, pop shield, take a breath) You can VERY CLEARLY see the shield pop in all of his examples - and the next headshot kills.
Nothing makes me smile more in a game of Reach than watching someone armor lock over a flag, and running in, grabbing the flag, and heading off. They look so... pitiful frozen there. :lol
Sort of a Maginot Line, in Spartan form.
I find it hilarious that folks bitched and bitched about the flag radius being 3m in Halo 3 ("You can hide behind a rock and return it!") and then Bungie reduces it to "you have to be sitting on the flag to return it" and other folks - not necessarily Dirtbag here, but I've seen plenty of complaints - complain that you have to be totally exposed to return a flag. Bungie can't win.