it's because you touch the spike!if you touch the spike you will die and respawn at the last checkpoint which is the last flag you touch.
Ohhh, so those are the green spikes. I thought they were just for decoration :D since I could just walk past them before (because of green color) did nothing
Yes, those are the spikes, if you take the green paint you will get a buff to become immune to any spike damage!I hope this explanation helps you :).
