diff --git a/chameleonic.p8 b/chameleonic.p8
index 11ed61c..ec2a908 100644
--- a/chameleonic.p8
+++ b/chameleonic.p8
@@ -652,7 +652,9 @@ function level:can_move(
  return true
 end
 
-function level:tug_crate(mx0,my0,dmx,dmy)
+-- argument is array-like: mx0,my0,dmx,dmy
+function level:tug_crate(t)
+ local mx0,my0,dmx,dmy=unpack(t)
  local mxy0=_mix{mx0,my0}
  local existing=self._crates[mxy0]
  if (not existing) return
@@ -1540,22 +1542,19 @@ function rope:_tug(hypothetically)
  local blocks = {}
  for i=#ancs-1,2,-1 do
   local ops_before_trash,blocks_before_trash=self:_calc_push(ancs[i+1],ancs[i],ancs[i-1],ancs[i-2])
-  local ops_to_do,corners={}
+  local ops = {}
   for b in all(blocks_before_trash) do add(blocks, b) end
   if #ops_before_trash>0 then 
-   ops_to_do=ops_before_trash
+   ops=ops_before_trash
   else 
    local ops_after_trash,blocks_after_trash=self:_calc_push(ancs[i-2],ancs[i-1],ancs[i],ancs[i+1])
-   ops_to_do=ops_after_trash
+   ops=ops_after_trash
    for b in all(blocks_after_trash) do add(blocks,b) end
   end
 
-  local ops=ops_to_do
-
   if #ops>0 then
    if (hypothetically) return ancs,i-1,ops,blocks
-
-   for o in all(ops) do level:tug_crate(unpack(o)) end
+   foreach(ops, level:tug_crate)
    return true
   end
  end
@@ -1604,13 +1603,14 @@ function rope:_tug(hypothetically)
   end
   
   if not invalid_move then
+   local mv = {mx0,my0,dmx,dmy}
    if level:can_move(false,mx0,my0,dmx,dmy,1,0) then
-    if (hypothetically) return ancs,0,{{mx0,my0,dmx,dmy}},blocks
+    if (hypothetically) return ancs,0,{mv},blocks
 
-    level:tug_crate(mx0,my0,dmx,dmy) 
+    level:tug_crate(mv) 
     return true
    else
-    add(blocks, {mx0,my0,dmx,dmy})
+    add(blocks, mv)
    end
   end
  end