To Err is human
We all make mistakes, and this looks like a grave error in performance calcultion. Top job for getting it back on the deck so everyone can tell the tale! I personally knew 7 who are not able to have that privillige in a very similar scenario .
The boys up front are going to take some heat, but don't be fooled,any one of us could be next. Learn from their mistakes.
Bottom line- Stick to SOP's...And if White Knight is in the other seat cut his throat!
Safe flying