16/10/12 - GTA4

First game that I've looked at is GTA 4, here's it's basic information then I'll move onto findings.

Name: Grand Theft Auto IV
Dev: Rockstar North
Year: 2008
Genre: Open World Action Adventure

In the beginning of the video I'm checking the NPCs response to being bumped into, the amount of force varies but because the player animation uses their arm to hit the NPCs as they pass, the amount the NPC moves doesn't need to change much. At 00:27 you can see the NPCs causing a reaction to bumping into one another which is a nice touch.

 0:33 I then decided to stalk an NPC to see how they react, to begin with i stayed fairly close but didn't touch and the NPC did look suspiciously over their shoulder at me on a number of occasions. They seemed to try and get away by changing direction too but he could have sped up or stopped and confronted my character for being too close. Then i got a little more annoying and repeatedly bumped into him. He didn't try and stop me and it was only when i accidentally pushed him into oncoming traffic that the NPC gradually got more and more agitated and ended up running away from me. The chase did spark some response from other NPCs and caused them to panic a little too. At around 3:30 i knocked the NPC down and it seemed like the NPC had died as he remained motionless while i walked around on top of him but as soon as i moved away he would get up. It would make more sense if the character displayed a little more self preservation and depending on how long I'd been chasing them or how hurt they were they could either try and push my character away or maybe try to protect themselves perhaps by curling into the foetal position? Another note was no-one tried to help him.

5:20 I tested the affect pulling a small handgun on NPC's would have. While aiming at one person in the crowd another could clearly see what i was doing but didn't react till i pointed the gun at them directly. While i was aiming at specific NPCs other were casually walking passed like nothing was happening would it make more sense if my actions affected a group of NPCs around me or made people avoid me? Some didn't even look at the gun before cowering... in the wrong direction.

6:22 I noticed with the small gun no-one took any notice of it until i pointed it at them so i brought out a slightly larger more obvious gun and wandered around for a little while to see if it got anyone worried. It didn't, so i found a police officer someone who surely should react to a civilian walking the streets carrying a large gun. He didn't react either and so i bumped into him a few times with it to see if that would make him notice. It was only when I'd annoyed him enough that he decided i was bad news but that was more due to me harassing him than me carrying a gun.

Possible tests: 
Have an NPC display some sort of self preservation when being harassed after falling over.
Have another NPC step in when someone weaker is being harassed such as someone older.
Have a group of NPCs notice other NPCs reactions to a gun being pulled out.
Have it so the NPC cowered while looking at the gun, or checked where you were while running away by looking over their shoulder.