From what I've read the extra damage applies (at random) to one shot per mag. Glitch or possible hidden perk (many exotics have them) makes little or no difference. I enjoy using the gun and feel it is no more 'OP' than Thorn.. you can two shot enemies with Thorn with a time on target of .36 seconds (almost half the time it takes to kill with TLW). Sure the target doesn't die in .36 seconds but if you know your weapon you can/will simply find cover and/or move on to your next target after firing off just two quick shots.. and from a MUCH longer range than you can effectively engage a target with TLW. Point being - while TLW needs to have its perk either more accurately worded in the flavor text or a bug fix, it is hardly the end all, be all. PS: you can 1-shot people with Hawkmoon due to a bug as well. Isn't going stop people from using it.