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Of course if you see a serious violent crime being committed , or about to be committed , and the police aren't around , you could stop it , or help stop it . I don't think there would be any repercussions .
Aside of course, from the chance of receiving a serious injury or death.
Just make sure you know what you're facing in situations like this. One very important rule to follow in life,,,,"Never underestimate your opponent"
Personal experience:
About fifteen years ago several friends and myself were at a major drag racing event. While in the stands, we saw a biker type of individual begin to beat up his girlfriend. I mean beat up as in punching her with a closed fist, knocking her over a railing and onto the ground, where he began kicking her.
I was shocked, mad and amazed that no one in these packed grand stands went to her aid.
Well I couldn't take watching this go on and I thought for sure he was going to kill this poor girl, so I looked over at my friends, they nodded and we all headed down the stands to stop this bearded jerk from inflicting any more damages on her.
The guy saw us coming and tried to make a stand against us but we had him pinned down pretty fast while another friend went for security.
The guy was obviously drunk and he was cursing and struggling to get free, but we weren't going to let him up until security arrived.
Can you believe that this beaten up, bloody face seriously injured girl, (who it turns out was also drunk) jumps on my back and tries scratching my eyes out? Talking about being ungrateful,,, I couldn't believe it!
Anyway, since we had her abusive boyfriend pinned down, a few other bystanders gained the courage to get involved and they grabbed a hold of this confused B__ch, pulled her off of me and held her until security came.
We were fortunate enough to have had an entire grandstand of witnesses, so when the police came into the picture, they just asked us a few questions then took both of them out in handcuffs.
This is just an example of how your good Samaritan involvement, can take an unexpected turn for the worse.