Lair made his way to the director's office, he needed him to witness this. Exposing Dr David was going to be troublesome and difficult if he simply used the camera footage especially if he was going to administer the same drug to grandfather Beau as he suspected he would. He was convinced that they might try to kill the man again with that same drug because it would look like a normal cause of death since he already presented with chronic heart problems.
The oldman's present condition was precarious and one more dose of that drug was going to kill him, he might die of cardiac arrest or maybe myocardial infarction or worse he might choke on his own vomit. How cruel could this people be?!
He needed the director to witness the scene with his own eyes because the camera might not be able to capture the drug Dr David might administer and the man could easily claim it he had administered another drug.