globals
 boolexpr cnd=null
 group gr_temp=CreateGroup()
 player p_temp=null
endglobals

function flt takes nothing returns boolean
 local unit u=GetFilterUnit()
 
 if GetWidgetLife(u)>.405 and IsUnitEnemy(u, p_temp) and not IsUnitType(u, UNIT_TYPE_FLYING)then
  // action with unit
 endif

 set u=null
 return false
endfunction

// --->
 set p_temp=GetOwningPlayer(some_unit)
 call GroupEnumUnitsInRange(gr_temp, x, y, 256. cnd)
// <---

function init takes nothing returns nothing
 set cnd=Condition(function flt)           
endfunction

and IsUnitEnemy(u, p_temp)

and not IsUnitType(u, UNIT_TYPE_MECHANICAL)

globals
 boolexpr cnd=null
 group gr_temp=CreateGroup()
endglobals

function flt takes nothing returns boolean
 local unit u=GetFilterUnit()
 
 if GetWidgetLife(u)>.405 and not IsUnitType(u, UNIT_TYPE_FLYING) and not IsUnitType(u, UNIT_TYPE_MECHANICAL)then
  // action with unit
 endif

 set u=null
 return false
endfunction

// --->
 call GroupEnumUnitsInRange(gr_temp, x, y, 256. cnd)
// <---

function init takes nothing returns nothing
 set cnd=Condition(function flt)           
endfunction