Piecing it together, it seems like Reguilon the Spurs left back became aware of something happening in the crowd. Called the ref's attention to it.Never seen this before - Has something sinister happened?
In the meantime Dier went to the Spurs bench and urged their physio to get across with a defibrillator.
Play stopped, ref then stopped the half early.
Been watching football for over 30 years never seen anything like this.