jarūlōn
The next sentence in the 17th Conlang Relay Text is:
se jarūlōn to jakērþe ī ñi jakērþi ōraen rā xō;
The first clause is a se clause and says that the horse was the source of jarūlōn, which means “a loud cry” or “a shout”. So the horse made a loud horse-sound and then… tune in tomorrow. 🙂