anchor.diff:  					sleep(5)
   					step(steam,direction)
   				spawn(20)
  -					steam.delete()
  +					if(steam) steam.delete()
   
   /////////////////////////////////////////////
   //SPARK SYSTEM (like steam system)
  
positive.code: 					src.oldposition = get_turf(holder)
  					I.dir = src.holder.dir
  					spawn(10)
  						I.delete()
  						src.number--
  					spawn(2)
  						if(src.on)
  
negative.code: 				step(sparks,direction)
  			spawn(20)
  				del(sparks)
  				src.total_sparks--
  