A Hong Kong university chief has promised to condemn police if they were found to have violated tear gas firing guidelines during a standoff with protesters shortly after which a student fell four metres in a car park and is now on life support.Hong Kong University of Science and Technology president Wei Shyy made the pledge on Wednesday as the owner of the car park released security footage of around the time when the fall occurred.Chow Tsz-lok, an HKUST second year computer science…