Remove the code that send the WASD commands to your slave client.

~w::
KeyWait w
IfWinActive, World of Warcraft
{
ControlSend,, {w down}, ahk_id %wowid1%
ControlSend,, {w down}, ahk_id %wowid2%
Return
}

~a::
KeyWait a
IfWinActive, World of Warcraft
{
ControlSend,, {a down}, ahk_id %wowid1%
ControlSend,, {a down}, ahk_id %wowid2%
Return
}

~s::
KeyWait s
IfWinActive, World of Warcraft
{
ControlSend,, {s down}, ahk_id %wowid1%
ControlSend,, {s down}, ahk_id %wowid2%
Return
}

~d::
KeyWait d
IfWinActive, World of Warcraft
{
ControlSend,, {d down}, ahk_id %wowid1%
ControlSend,, {d down}, ahk_id %wowid2%
Return
}
All of that.