They wont. Laskar Gah is like 200KM away from Pakistani border. Its not like TTP hit and run tactic where they will use Afghan territory to run and hide. There is some serious sh|t happening in Helmand, Afghan police and Army is on the run. And if they out of their stupidity blame Pakistan for this, they better handover Afghanistan to Pakistan.
First they talk to Afghan Taliban for peace talks and right bang in the middle of talks, kill their leader, what do they expect in return? Its like Abdullah Abdullah is eliminated right in the middle of talks by Taliban, would the Kabul regime come to talks with Afghan Taliban afterwards?
They have shoot themselves in the foot and the cost I am afraid will be paid immensely by Afghans who got nothing to do with this internal conflict between Afghan Taliban and northern Alliance Kabul regime.