diff --git a/sins/mutation.py b/sins/mutation.py
index 625ec5b..74878e0 100644
--- a/sins/mutation.py
+++ b/sins/mutation.py
@@ -54,20 +54,14 @@ def generation(queue: Queue, shellcode: bytes):
     queue.put(result)
 
 
-def growth(*, shellcode: bytes, length: int) -> bytes:
-    if length <= len(shellcode):
-        return bytes(shellcode)
-
-    opcodes = disasm(shellcode)
-
+def growth(*, shellcode: bytes, objdump: str) -> bytes:
     max_op_len = 15
 
-    if len(shellcode) > len(opcodes) * max_op_len:
+    if len(shellcode) > objdump.count('\n') * max_op_len:
         return bytes(shellcode)
 
-    for mnemonic, op_str in opcodes:
-        if mnemonic == 'nop':
-            return bytes(shellcode)
+    if objdump.count('nop'):
+        return bytes(shellcode)
 
     shellcode = bytearray(shellcode)
     shellcode += b'\x90'
diff --git a/sins/run.py b/sins/run.py
index 659fa19..c2955f4 100755
--- a/sins/run.py
+++ b/sins/run.py
@@ -10,6 +10,7 @@ import logging
 
 from .mutation import generation, mutate, seed_shell, growth
 from .orm import db_config, ScrapNode
+from .disassemble import objdump
 
 
 def sins():
@@ -94,13 +95,17 @@ def sins():
                 lineage += 1
                 continue
 
-            if not result:
+            if result != len(scrap):
                 lineage += 1
                 continue
 
-            scrap = growth(shellcode=scrap, length=result)
+            logger.debug(f'result: {result}, {len(scrap)}')
+
+            opcodes = objdump(scrap)
+            scrap = growth(shellcode=scrap, objdump=opcodes)
 
             parent = ScrapNode(child=scrap, parent_id=parent.id)
+            parent.objdump = opcodes
             session.add(parent)
             session.commit()