Question

What does the actual third law really look like?

Answer 1

Walking: when you walk, you push the street i.e. you apply a force on the street and the reaction force move you forward.
Gun Firing: when someone fire gun the reaction force push the gun backword.
Jumping to land from boat: The action force applied on the boat and the reaction force puch you to land. The action force push the boat backword.

Answer 2

Firstly, let's look at force at the atomic level. This is where the force is really happening. The forces that we feel in everyday life are generally the forces between atoms and molecules (intermolecular forces). I'll use Helium atoms as an example, because they're easy to draw. When two He atoms get close together, their electron shells overlap and cause them to repel each other. Note that you never get a situation where one atom repels, and the other does nothing, or one repels and one attracts. Always they both repel each other, or both attract each other, and both atoms feel the same magnitude force, in exactly opposite directions.