In an open letter to LSE director Craig Calhoun and chairman Peter Sutherland, the six students - Hoe-Yeong Loke, Mila Akimova and four unnamed others - said they "felt compelled to establish the basic facts of the case".
Whether it was an enforced change because of injury or a tactical one, Celtic manager Neil Lennon had started the second half with a more attacking formation, with midfielder Ki Sung-Yeong coming on for Mulgrew and Joe Ledley moving back to left-back.