Episode 6.5 of VINLAND SAGA SEASON 2.

 The short video depicts a scene not shown in the anime where Thorfinn, as he appears as a member of Askeladd's raiders, cuts down some men in the middle of a raid. When he enters a nearby house, he sees a family cowering within... 

(Source: Anime News Network, edited)

The second season of Vinland Saga. 
After his father's death and the destruction of his village at the hands of English raiders, Einar wishes for a peaceful life with his family on their newly rebuilt farms. However, fate has other plans: his village is invaded once again. Einar watches helplessly as the marauding Danes burn his lands and slaughter his family. The invaders capture Einar and take him back to Denmark as a slave.
 
Einar clings to his mother's final words to survive. He is purchased by Ketil, a kind slave owner and landlord who promises that Einar can regain his freedom in return for working in the fields. Soon, Einar encounters his new partner in farm cultivation—Thorfinn, a dejected and melancholic slave. As Einar and Thorfinn work together toward their freedom, they are haunted by both sins of the past and the ploys of the present. Yet they carry on, grasping for a glimmer of hope, redemption, and peace in a world that is nothing but unjust and unforgiving.
 
(Source: MAL Rewrite)

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