params [
["_unit",objNull,[objNull]],
["_part","",[""]],
["_damage",0,[0]],
["_source",objNull,[objNull]],
["_projectile","",[""]],
["_index",0,[0]]
];
if (!isNull _source && {_source != _unit}) then {
if (side _source isEqualTo west) then {
//晕枪判断
if...