A terrified stable boy who had hidden in a nearby stall when the wererats arrived to harass the bull is completely unmanned by the ear splitting thunderclap from William's lance of thuderbolts striking a wererat dead, and he leaps out of his hiding place in the stall some 10 feet from William and Champion and the war bull, and shrieks!
EEEEEEEEEEEEEHHH!!!!
He then gains his wits back on seeing the heroic young knight flinging a wererat corpse off his lance astride a belligerent steed, and even the stubborn war bull tossing a wererat with its mighty horns, and the wererat scurrying away into the night, squealing in pain and fear....
That's right, rat-scum! Run away!! Haha!!
Turning to Sir William, the stable boy bows deeply....
Thank God you came when you did, brave sir! Thank you for saving the bull....and me....from those pesky, murderous wererats! They've been a right bloody terror ever since the dragon came two years ago!
Gesturing to the powerful and ornery bull: He's a fine war bull, trained for battle.... You saved his life, I think.... So I'll trade you this bull for your horse, an even swap, good sir! What say ye?