If I disliked him I would let him lie there.. (jk ofc).
Answer: First step is I would calm down and not panic and try waking him up, if that didn’t work. I would call the ambulance while trying to do CPR, and continue doing CPR until they got there. And let them handle it. When he is in the hospital I would let my co-workers know and control everything. Once he or she is better I would welcome him back and continue working, whilst still checking on him.
(Hope this helped, please give me brainliest if so, if not please let me know what I gotten wrong, also if you need any more help let me know!)