Had a similar experience when farming helium. But after several attempts of alerting this guy (level 10) he saw the chest and proceeded to follow me on my chest run to gain 64 helium. He seemed greatful as he spotted a chest i didnt and alerted me in a similar way. I waited for him to catch up before opening chests and vice versa. There was a strange silent understanding between us. Friendly salute and off he went back to orbit. Nice when you find like minded guardians!