True.
But the events took turn while the Indian pilots were on their way home and were already in Indian airspace. Why would Mr Sikhand, after having left Pakistani airspace, turn his fighter around to 're-enter' Pakistani air space?
'One Gnat, however, was seen to be behaving strangely; having gone back, it turned about and re-entered Pakistani airspace.'
After Mr Mirza's F-104 had made its appearance, the Gnats broke off and started heading home. At this point something went wrong in Mr Sikhand's cockpit and he lost contact with his wingman. Strangely, he turned his Gnat around and flew straight into Pakistani airspace. At some point, shortly afterward, he must have realised that he was in Pakistani airspace. He noticed an 'airstrip' and landed on it. A clear case of disorientation, which was perhaps compounded by one or more system failures.
The point I am trying to make is that Mr Sikhand was not
forced to 'surrender' or land, as is the popular belief among PAF enthusiasts. In fact, Mr Hakimullah's F-104, who is credited for enforcing the 'surrender', had no role in it.