Twist away - if the worse comes to the worse we can always eat the duck next Christmas. (Only joking....
)
I believe I read somewhere that the record height for a birdstrike was in the high 30's. Either Andes or Himas I think. Cannot recall the species.
EDIT: Found a link of sorts. http://www.birdstrike.org/commlink/top_ten.htm and http://www.pprune.org/forums/showthread.php?t=197260 even mentions your bird in post #18