Pervez Hoodbhoy explains the background of these videos in an email thus:

Tzortzis (Greek, lives in London) converted to Islam and is now hugely popular among young people brimming with faith…The man is a real entertainer. I had no idea who he was…some students at LUMS [Paksitan's Lahore University of Management Sciences] asked me to debate him. I agreed. The Islamic society here flew him in at a few hours notice.

Unfortunately, the debate ended badly. This was the only challenge Tzortzis received at a Pakistani university.

The second video is Pervez commenting on what happens at the end of the first video.