He’s running as fast as he can in the conditions to go to someone else’s aid in a true emergency situation. Fair play to him for thinking of the rider before himself.
On the issue of marshals, I’ve always found the argument made by road racers along the lines of “It’s our lives, we should be allowed to do what we want, so go mow your lawn,” somewhat invalidated when marshals get injured or killed, as has happened in recent years on the Island.