The patient is clearly in pain as the NG tube goes in. It’ll all be worth it, you tell yourself. A little more esophageal trauma and gastric irritation will probably help any peptic ulcer / erosions/esophagitis/varices/Mallory Weiss tear/AVMs to…heal more…right?

A moment of dread dawns on you. Just as you realise this is perhaps the single worst thing you could do to an inflammed area that is full of bleeding points with recently formed clots loosely attached to the epithelium that are barely keeping the patient alive, the NG aspirate fills up with fresh red blood. The patient vomits up some more fresh red blood, and two thirds come out the mouth. The last third obstructs his airway as he slips into unconsciousness.

At least you helped bring about a relatively quick death, drowning in his own blood.