NEVER engage with Andro, unless you plan on leading him back to your teammates. Annoy him if possible by getting behind but your goal is to lead him to your teamates so you all can bring him down together.
Encountering Grover in long range spaces - don't PEEK around the corner.
Good Grover players throw axes preemptively and you can take a lot of damage. Use short sprints between cover. This way it's harder to predict where to aim.