Do knights fight alone

Answer 1

Rarely. They mostly fought in groups. Even Medieval tournaments - certainly the ones before 1500 AD - were only partly the one-on-one affairs with the long lances that Hollywood shows us. Much more often is was two groups of knights with blunted weapons hacking away merrily into each other. Those blungeoned to the ground forfeited ransom money (just as in real medieval battles) and being killed or dying from your wounds in a tournament was a common occurrence.

Answer 2

In medieval times, very few knights fought alone.