Video at Buffalo protest shows police pushing 75-year-old man

Warning: This video contains graphic content. Two officers in Buffalo have been suspended without pay after video circulated online of riot police appearing to push a 75-year-old man during a protest against the death of George Floyd. 
 https://www.youtube.com/watch?v=vn-lERkqIWw
 https://www.youtube.com/watch?v=bweA_gqSb0g
 https://www.youtube.com/watch?v=4jRmKIZeowE