In Kingdom Come: Deliverance 2, Lord Semine's wedding to Agnes faces a snag: his ceremonial sword has vanished. Your mission: recover it.
Radovan reveals the missing sword, mentioning a suspicious yellow-clad individual. Your search for the yellow-clothed man leads you to several denials, but eventually, a clue surfaces: someone saw a man in yellow heading upstairs in the stable. There, you find Hans, romantically involved, but innocent. However, Hans witnessed Svatya, the bailiff's son (and the bride's brother), stealing the sword. Hans, though a witness, didn't follow Svatya.
Svatya is located near the musicians at the wedding festivities. He readily confesses to the theft, motivated by resentment towards Old Semine. His impulsive act involved tossing the sword into a nearby pond.
The pond's location is easily found; either follow the path Myshka took you on after your dance, or locate it behind Radovan. The sword is visible in the water; retrieve it.
Return the sword to Radovan. You can choose to reveal Svatya's guilt or remain discreet. Once the sword is returned (and any time-sensitive pre-wedding tasks are completed), the wedding proceeds, allowing you to advance the main quest.