Please translate 他听到我们这边有水瓶掉下去 砰地一声 （正好是停车场出口 万一有车就很危险）他马上和保安指出来 小朋友好乖哦
I'm not going to do a word-to-word translation. The original text seems like a piece of transcripts of someone talking. 

In the parenthesis, where you can't translate, it is to describe where the accident happened - it is right at the exit of the parking garage. It can be very dangerous if there is a car drive by

他马上和保安指出来 is "he immediately told(or point it out to) the security guard". 和 is not "and" here, but "to".

小朋友好乖哦 tells me that in the previous description, 他 is a 小朋友. This sentence is opinion from the person who told this story.