I don't approve of the out-of-bounds death, but I'm not so naive as to think it'll ever go away. Especially considering all the nonsense invisible walls and utterly absurd places which will kill you - they REALLY don't want you to deviate from the script. (There's one canyon which loops around into a battle arena... you are fine if you walk the path, but if you go over the hill to [i]exactly the same place[/i], you will die. What the -blam!- does Bungie have against mountain-climbing?)
[b]But could we at least get more than 4 seconds to turn back? Like maybe 20 or 30 or something?[/b]
Particularly in places like the moon where everything looks the same so you can't really tell when you're obviously off-script, if you've driven your sparrow somewhere cool-looking and got some sweet air, only to realize you're in magical, invisible death-field area, the odds grow very small that you can correct your 'mistake' (ugh) going back up that incline in time to save yourself.
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In Reach the ten second kill boundary was abused in multiplayer.