Found a fun little bug starting up the Hudson Refugee Camp on hard mode (not tested in other modes). If you turn to the left after the front gates open, you will find a little yellow air compressor tank on top of the debris. If you shoot this tank, you hurt your teammates. We had each of us shoot it and it would damage each of us in the run. This can also cause a "bleed" status. We did this to the point where you can drop whoever you are with down to 0 hp and they bleed out. My random shooting of debris came across this fun little bug!