local function origBoyCollision( self, event )
    if ( event.phase == "began" ) then
        print( " origBoyCollision: " .. self.myName .. ": collision began with " .. event.other.myName )
        print( " origBoyCollision: " .. self.myName .. " element " .. event.selfElement .. " " .. event.other.myName .. " element " .. event.otherElement)
    end

    -- origBoy hit origMonst
    if ( self.myName == "origBoy" and event.other.myName == "origMonst" ) then
        if (( event.selfElement == 3 and event.otherElement == 1 )  or ( event.selfElement == 3 and event.otherElement == 2 )) then
            local atX, atY = event.other.x, event.other.y
            local group, key = event.other.group, event.other.key
            Runtime:removeEventListener("enterFrame", enemy)
            print(" ---------am printing force = " .. theForce)
            audio.play( popSound )
            event.other:removeSelf()
            print(" ----------------------killed original monster ")
            --get point for killing monster
            local newScore = gameScore + mCeil(5000 * theForce)
            setScore( newScore )
            timer.performWithDelay(33, function () swapMonst(atX, atY, group, key) end, 1)
        end
    end
end

function swapMonst(atX, atY, group, key)
    physicsData = (require "gamePhysics").physicsData(0.333)
    local replacementEnemy = display.newImage("images/monst1.png")
    replacementEnemy.x, replacementEnemy.y = atX, atY
    physics.addBody(replacementEnemy, physicsData:get("1bMonst"))
    replacementEnemy.myName = "repMonst"
    replacementEnemy.bodyType = "dynamic"
    replacementEnemy.isFixedRotation = true
    replacementEnemy:addEventListener( "touch", startDrag )
    replacementEnemy.collision = repMonstCollision
    replacementEnemy:addEventListener( "collision", replacementEnemy )
    replacementEnemy.postCollision = monstPostCollision
    replacementEnemy:addEventListener( "postCollision", replacementEnemy )
    function replacementEnemy:enterFrame (event) monstWrap(self, event) end
    Runtime:addEventListener( "enterFrame", replacementEnemy )
    --function enemy:enterFrame ( event ) timeLoop( self, event ) end
    --Runtime:addEventListener( "enterFrame", enemy )
    levelGroup:insert(replacementEnemy)
    group[key] = replacementEnemy
    replacementEnemy.group, replacementEnemy.key = group, key
    print ("ORIGINAL MONSTER REMOVED NEW ONE CREATED WITH SAME OBJECT NAME: ORIGMONST")
end --end swapMonst

local function createEnemy(group, key)
    local newEnemy = display.newImage( "images/monst2.png" )
    newEnemy.x, newEnemy.y = 420, 130
    physics.addBody( newEnemy, physicsData:get( "2bMonst" ) )
    newEnemy.myName = "origMonst"
    newEnemy.bodyType = "dynamic"
    newEnemy.isFixedRotation = true
    newEnemy:addEventListener( "touch", startDrag )
    newEnemy.collision = origMonstCollision
    newEnemy:addEventListener( "collision", enemyX )
    newEnemy.postCollision = monstPostCollision
    newEnemy:addEventListener( "postCollision", enemyX )
    function newEnemy:enterFrame ( event )
        monstWrap( self, event )
        timeLoop( self, event )
    end
    Runtime:addEventListener( "enterFrame", newEnemy )
    levelGroup:insert(newEnemy)
    newEnemy.group, newEnemy.key = group, key
    group[key] = newEnemy
end

createEnemy(_G, "enemy")