Cameron - he asked for an OFFENSIVE knife. Offense means he intends to START the very situation you refer to escaping from.
The use of a knife as an "offensive" weapon is almost universally regarded as chancy at best, if not just plain silly. If it's your stated intention to inflict deadly damage upon an opponent, getting within arms reach to use a weapon that requires extensive training to affect a kill quickly and quietly is rarely sound advice.
Had he asked - in any one of his several posts - about a defensive knife, the answers would have been significantly different. But a defensive knife is meant to protect the user, not necessarily inflict extreme, lethal damage on the opponent.
Bladeforums is frequented by people who take their right to carry knives very seriously, and in many cases, know first hand just how precariously our grip of such rights is. Many other members are active LEOs, military personnel, and agents of other government organizations.
As such, blatantly false claims of involvement with government agencies, coupled with requests for information on the illegal and immoral use of our knives tends to evoke a "less than friendly" response.
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AKTI Member #A000832
"Sometimes you eat the bear, and sometimes, the bear eats you."