Yes, I saw the one officer speak into his mic and he was probably calling for a medic, but to me, seeing the man was elderly (now, this is not an ageist kind of thing), adds to an increased level of care.  Same as if say this was a pregnant woman or a child. Also, if a police officer finds a need to "put hands-on" a person, then it is reasonable to assume the person is in the "custody" of the police, therefore, the police have a legal responsibility to the person's care.

Now, as for this particular type of training/action, years ago in Florida during riots, a new method of dealing with crowds was developed and that type of formation is typically used as a wedge-like movement to clear out a crowd or people.  Usually, behind the front people, there is an arrest team responsible for the collection of people that do not move back and away.  The job of the front line people is also to just keep moving forward and not stop.  That is probably what is going on there, but what is seen in the video was that there wasn't anyone else around except for the one protestor. 

This may sound weird or callous, but there times when police should not worry about "optics" (for example, say instead of this particular protestor, the police were instead faced with a young man raising a piece of rock or an object while appearing to attempt to strike the front officer, then, I don't think people would care if the protester was pushed to the ground) and there are times when they really should be cognizant of "optics".  To me, this was one of those times and it is just so disappointing it did not happen.