You'd never believe it, but I spent a whole 5 minutes on this thumbnail.
On Yuan Shao's side in DW4 Guan Du, Guan Yu has a route he'll go on, taking heads of specific officers, until he finishes with Yuan Shao. Normally he's stopped after taking Wen Chou's head, because Liu Bei heads straight towards him at that point and they retreat together. Liu Bei doesn't even encounter any enemies during this time. So the only way to see Guan Yu's full rampage is to play as Liu Bei and avoid him.
Also, if you approach him as someone who isn't Liu Bei, his AI will change to pursue YOU across the entire stage, only being stopped if you lure him to Liu Bei or defeat him. Also he gets Xun Chen's name wrong, but I don't think anyone dared to correct him here.
![](https://i.ytimg.com/vi/RIbvawF2LmU/maxresdefault.jpg)