This sighting took place not too long ago. From memory it was a Thursday night at around 11pm - 12am (nz time) So let's begin with what happen before the sighting took place. Me and my mate, who is 3 years younger than me, were walking around the town playing Pokemon go (yes at night as there less people around). We have done this many times before and have walked through the location many times before with no encounters happening as other times we have been through at 12am - 2am (roughly).So this time it happened on Thursday can't remember the date or month but to get rough range (end of October - early November 2016) me and my mate were battling the gym as normal. Once we took it we decided to walk to the stop banks at the end of the school grounds, which are roughly 30 meters from where we were battling.
Now other times we did this nothing happened at all but when we got to the new fence that's there (which is at bottom of the stop bank), we stopped to open it. Before I opened the fence I saw something ran out of the sliding door to the classroom and through the fence which is steel and has a small gaps in it. About 5 seconds later the school burglar alarm went off. Which spooked me and my mate out as we were the only ones there and the gate isn't alarmed either as we have opened it many times before. As we got to the top of the stop banks I told my mate what I saw which was a small creature like ghost (white see through well not all the way through as you can see thickness of white. Kind of like a cat size closer to a small possum.) Weird thing is my mate told me he saw a big body like structure of a large dog running and jumping over the chest height gate/fence (the measurement from the door to top of stopbank is impossible).
Once we got to the top we looked towards the road and the creature had already made it to the end. To me it took faster than any normal animal in NZ. My mate said the creature made it to the end (100-150 meters) in four steps/leaps. So me and my mate chose to run down the other direction on the stop bank into the dark which is 200-300 meters worth until we hit a street again as we didn't want to go back through the school which is 148 years old. And the alarms were still going off. The history of the classrooms is that they are new ones (roughly 10 years old), I will never forget that night at all and I'll never forget that thing I saw still locked in my head. It wouldn't be anyone else either as there was no signs of break ins or broken windows or forced entries as these classrooms are well high tech in security firmware with cameras both outside and inside the rooms/hallways.
If anyone had a similar experience or knows what I saw or needs more information feel free to reply or add comment.