Decision
At times like this where Tristan was surrounded by dozens of Kingsblade, he basically already fell under the king's mercy. After all, his life could be taken out any time with a single gesture from the latter.
Tristan did not think the king would consider his opinion at all, because they both knew who held the power at the moment. Therefore, he had to somehow increase his leverage in order to make his voice matter.
Hence, the unimaginable idea he thought of.
If Tristan could manage to take the king as hostage, his chances of being considered would be higher than now. Besides, in the probability that the king would not listen to his reason despite the risk, he could still hijack the flying ship and take off somewhere faraway together with Layla.
The idea seemed a bit too hard to pull off considering the old man Tobias could stop him as easily as a snap of his fingers, as he did earlier. Even so, it was still a feasible plan to enact.