Witnessing the death of the elder did manage to give him some degree of satisfaction.
Of course, he didn't simply kill them for that reason alone. The man did insult him and hurt his man.
Aside from that, Tristan also captured him from a winning battle fair and square. The elder was his prisoner, so he believes it was well in his rights to do whatever he wanted with him.
Even on earth, there was such a thing as a prisoner ransom. Therefore, he refused to just release them. And above all these reasons, Tristan's main deciding factor in killing the man was as simple as the desire for blood.
Once more, Tristan cast his skill.
[Blood extraction]
[A mix of 250 high-quality blood cells were found]
[Now extracting and filtering the blood cells...]
[1150 blood essence points gained]
