Mars square Moon has hot emotions and can make one pretty excitable.On the negative it can make one feel easily threatened which can have two outcomes:
The individual may learn to be hostile to others- because they feel defensive and don't wait for others to "harm" them.
This can manifest as being mean, condescending, picking fights with others, insulting others or making a mockery of those one deems as "weak" or "feminine"
The other outcome is of a person who is passive agressive and often acts "victimised" by the harshness of others or their abrasive attitude towards them
This often can be someone who crys wolf a lot, gets others to fight for them, acts like the martyr and makes the other person out to be the bad person or learns to manipulate people in order to get them to do what they want.
In its positive form, this aspect is dynamic and energizing. The individual is often infused with a "can do" attitude and may enjoy solving or obliterating problems.
For someone who has the aspect, i would advise them to not look for "triggers" or focus attention to things that make them ill at ease. Because anger is very contagious and these people are usually the 1st to get it.
For those who are in relationships with such people, I would suggest avoiding them when they are in that state or withdrawing from them when they get angry
As a Moon/Mars square individual myself, IME the momentum of such feelings can be redirected to a positive outlet. But it takes practice and conscious awareness to do that
Sometimes sleeping can detach one from such intense feelings or distancing oneself from the issue as far as possible.
If someone who has this aspect is on autopilot, refrain from engaging them whilst they are in that mood. Anger wants to be fanned or it dies. So don't fan it. Just dose water on them by refusing to engage with them whilst they are in that mood and/or attitude.
Moon/Mars when positive,can be a lot of fun to be around. As they are enthusiastic,passionate and very engaging. But this positivity needs to be harnessed and is not always the reflex modus operandi.