I think it must be something like:
Maelodrán grandson of Díma Chrón here, from the Scorbraige of Leinster,
after killing of your sons and for striking of your own head from you now -
while seizing his head to him.
>> 28. Maelodrán ua Díma Chróin sund, di Scorbraige Lagen,
>> iar marbad do mac & do béin do cind dít fesin ind-or-so
>> -- la gabáil a cind chucai.