Survival
Realizing that something was definitely wrong, Tristan would not take any chances as he quickly casted [Blood Seal] on the rider who had talked to Astrid. Immediately after, he dashed towards the other rider who watched all of this happening.
Seeing the latter was trying to gallop and run, Tristan swiftly took the sword out of his spatial ring and threw it towards the barbarian.
The sword did a line through the air before swiftly penetrating the back of the barbarian, sending him flying from the horse's back. The moment he reached the barbarian, Tristan was surprised to find the horse was dead as well. It looked like the sword somehow made its way to end the latter's life.
Looking at the horse's lifeless body, Tristan was annoyed as he definitely could use it for the journey. Alas, what already happened would not be able to come back.
When Tristan returned to the group, he quickly interrogated the barbarian who already fell under his control.