Remember that you can shoot while falling. If you see people near you when landing you should try to shoot at least int their general direction or maybe toss a grenade at them. I haven't had the opportunity to try it, but that should disrupt people aiming at your landing point. Potentially you might even splat them.
For safety though shoul should look at how your team mate is moveing on the map. A team mate running straight forward? Likely not in combat in unless they are a roller user. A team mate in an area that is also becoming more covered in your colour? He is liking painting/repainting a spot and is probably safe. A team mate not moving? Probably your team's charger or a shooter in a good position, safe. Are they moving eraticly or in a method that resembles strafing back and forth or just really weirdly? That team mate is probably in direct combat and you should take caution if you want to jump towards them.
At least I think those make sense. I do not recall how closely the map markers mimic the player, but the general frame of this advice should apply.