Serious or not, it's unnecessary. [Shun's tone is somewhat dismissive in passing on the thanks, but at least it's not anything worse than that. Still, he inclines his head slightly at the farewell.]
You might. [Even if it sounds like Shun's taking it more as a factual statement than a farewell.]
no subject
You might. [Even if it sounds like Shun's taking it more as a factual statement than a farewell.]