Did your oil pressure light come on?
Working in Aviation, this is a huge pitfall. We "TRY" not to do two things at once. If two people involved, you're either helping each other on one item or two separate items which each individual is responsible for.
Torque seal or witness paint is a huge help. Torque and seal as you go. Nothing is put on loosely or just "started". It either ON or OFF. Otherwise, we place warning tags.
Just some tips for next time you two work together.
BUT DID THE OIL PRESSURE LIGHT COME ON?