@izzythepush,
Spearing is when you put your head down and run into the opposing player full force. It caused a lot of injuries.
In football you have a defensive team and an offensive team. One team is on field at a time, so they can hydrate when they are off the field.
I know very little about soccer it was not played when I was in college.
I am a long-distance runner and hydration very important. One of the women ran to point her kidneys quit others were hospitalized They would need to rotate players or use a device worn on your back that contained fluids that could be accessed at any time.
In one race this year around the fourth of July I overdid it and went into heat exhaustion it was 96% that evening I don't know how close I was to heat stroke. It was 20 minutes before they could get me on my feet. The players will have to be hydrated someway.
Emotions flare in the moment but soon fade away.