Did Dacey Mormont kill a guy with a wine flagon? (Spoilers Extended)

We find out at the Red Wedding that Benfrey Frey (what a name) gets smashed in the face by Dacey with a wine flagon:

Young Ser Benfrey had seized Dacey Mormont by the arm, but Catelyn saw her grab up a flagon of wine with her other hand, smash it full in his face, and run for the door. It flew open before she reached it. Ser Ryman Frey pushed into the hall, clad in steel from helm to heel. A dozen Frey men-at-arms packed the door behind him. They were armed with heavy longaxes.

"Mercy!" Catelyn cried, but horns and drums and the clash of steel smothered her plea. Ser Ryman buried the head of his axe in Dacey's stomach.

RIP Dacey, but its possible you took Benfrey out too:

AFFC, Appendix

{SER BENFREY}, Lord Walder's sixteenth son, died of a wound received at the Red Wedding

ADWD, Appendix

{SER BENFREY FREY}, Walder’s sixteenth son, died of a wound received at the Red Wedding,

Now the potential exists that someone else killed Benfrey (ranging from one of Robb's men, to friendly fire from the Freys/Boltons/northmen or even intentional death via someone like Black Walder), but (at least to me) none of those are as cool as Dacey Mormont killing a guy with a wine flagon.

She was a true warrior woman of ice and fire (shameless self plug), RIP.

TLDR: Dacey Mormont (the heir to Bear Island) possibly killed Benfrey Frey with a wine flagon.