Whether application of the four-level sentencing enhancement for 'permanent or life-threatening bodily injury' under U.S.S.G. § 2A2.1(b)(1)(A) requires affirmative proof of permanent or life-threatening injury or allows lower courts to draw their own conclusions about injury dangerousness

Should application of the four -level sentencing enhancement for “permanent or li fe-threatening bodily i njury ” under U.S.S.G. § 2A2.1(b)(1)(A) require a ffirmative proof that the i njury was permanent or life-threatening, or should lower courts continue to draw their own conclusions about the dangerousness of a particular injury , even if that practice results in wildly inconsistent application s of the enhancement ?