Eren
Eren resisted the urge to be pendantic and point out that it would depend on the nature of the promise and what sort of contract was involved, deducing that doing so would likely not meet with good results. Instead, he replied thusly:
"Regardless of whether it is or not, he doesn't much look to be in the mood to argue over such things."
But Eren was then taken aback as Yagenas, apparently with balls of steel in hand, went outside and called up to the dragon itself.
Eren briefly gaped.
Can't let him face it alone.
Then ran outside, bow also in his hands, but not pointed up at the dragon. Summoning all his strength of will, he felt as if he was in mortal peril as he looked up at the primal serpent, but somehow managed to not run away.