Who did he call while pacing back and forth in the lobby? Could he have called Dr Ershovich at that time??
Good questions Pep. How bout this? He was telling Ershovich "you could be in some trouble. Get rid of whatever evidence you've got". Maybe Anna confided in Dr. E something that would implicate Howie. Maybe Dr. Ershovich was giving prescriptions to Anna that weren't supposed to be mixed.
I'll chime in here, being the devil's advocate:) Suppose Howard's cell phone call in the lobby, if it happened, was something innocuous? We heard Anna and Trimspa were served that day of her death with a lawsuit from a disgruntled customer/s. Perhaps that phone call was to a lawyer about that subject.