Seems like you skipped over a whole mess of stuff like washing hands, putting on sterile gloves to do one thing, taking them off, putting on a new pair, preparing the syringes prior etc, scrubbing port with cloro-whatever in a circle starting from the center, doing that again.... etc, etc. If he's not doing all this, he's not being cautious/sterile enough and is at risk of infection.
Oh, and we are taught to flush with Saline first (to flush out old heparin), then flush with heparin last, which will sit in the line.