Soon Skrzetuski was sent by Prince Jeremi Wiśniowiecki to Zaporizhian Sich as an envoy. During the mission he was wounded and taken captive. He was saved by Khmelnytsky, who was grateful for Skrzetuski's help. Khmelnytsky, however, didn't agree to set him free at once. Skrzetuski as a captive witnessed Polish defeat in Battle of Zhovti Vody.
In the meantime Bohun discovered the old princess' betrayal and attacked Rozłogi, intending to kidnap Helena. She managed to escape, but the rest of family was killed and the dwór was burnt by peasants. When Skrzetuski regained his freedom, he headed to Rozłogi but found there only ruins. He grieved, thinking that Helena was dead. He was found in Rozłogi by his friends.
Skrzetuski returned to the service of Wiśniowiecki and soon met Zagłoba, who told him that Helena was alive and safe in Bar. Skrzetuski planned to go there, but he received the news that the city had been captured by Bohun. Skrzetuski set off to search for Helena but failed to find any trace of her. He only received information that his beloved was murdered in the monastery in Kiev (which was not true). After these news Skrzetuski became ill. He didn't know that Helena was found by Rzędzian, Wołodyjowski and Zagłoba.
After recovering, Skrzetuski went to Zbarazh, where he bravely fought during the siege. After Podbipięta's death he decided to sneak through the Cossacks' camp and go to John Casimir to let him know that soldiers in Zbarazh needed reinforcements. He managed to fill his mission - the king went with his army to Zbarazh and soon the treaty was signed.
During recovery Skrzetuski was treated by Rzędzian who told him that Helena was alive. The girl soon arrived and they went to Lviv to get married.
Skrzetuski is described as an attractive, dark-haired young man.
He was a very young man, of spare habit of body, dark complexion, very elegant in manner, with a delicately cut countenance and a prominent aquiline nose. In his eyes were visible desperate daring and endurance, but his face had an honest look. His rather thick mustache and a beard, evidently unshaven for a long time, gave him a seriousness beyond his years.[3]