Was blowaway power entered ? 2 crew and 2 pax in a ++ is about as light as it gets. The PF and the PM would have been awoken by the drooping rotor that's for sure. I also believe, but stand to be corrected, that 10 minutes accumulated 2 min power is allowable before a tear down is required.
From the RFM
Blowaway is an escape logic associated with dual engine limiting that removes the takeoff power limiter in certain cases to provide for extraordinary and unforeseen circumstances where increased power beyond the takeoff power limit is required for continued safe operation. Extraordinary turbulence encountered in the final moments of a landing approach to an oil platform or pilot misjudgment of closure rate upon landing to a confined area can serve as operational examples where increased power beyond the limit could be an important contribution.
The blowaway logic can be latched in either of two ways: a slow to moderate rotor decay rate to 100% Nr or an excessive decay rate of 5% per-second or greater occurring at 104% Nr or less. In both cases rotor droop is occurring because more power is being commanded than the engines can deliver at the takeoff power rating, but in the latter one, the logic is applied sooner to counter the faster rate, presumably related to a more urgent situation. Blowaway is reset over a ten second interval that is initiated when Nr is restored and exceeds 106%.
When the logic is tripped, the dual engine takeoff limit is replaced by the 2-Minute single engine N1 limit or 115% torque whichever occurs first or in combination. Although normally both engines will blowaway, one engine may trip in some cases at the 100% Nr point if the droop rate is slow and enough power is realized from it to arrest droop and increase the rotor speed before the other engine trips. Other than in the colder ambients where 115% torque can be achieved at low N1 values, blowaway may be expected to result in 2-Minute N1 usage, and therefore, time added to the cumulative 2-Minute counters.