Cruel experience

I came to office at usual time 9:10am. I recognized the SUV in the parking lot .. it belonged to my manager. I made notes of the things I wanted to discuss with him today. We usually discussed about pending issues first thing in the morning since we got caught up in meetings almost all day long.
My manager sat in the cubicle next to mine. As I entered my cubicle, I saw my manager's manager by his cubicle. She stood there waiting for something.... perhaps a print out she wanted from him I thought and quietly entered my cubicle. As I settled, I heard some noises of desk/chair being pulled, wires untangled, coins being emptied from lockers etc ... "He must be really searching hard for those print outs" I thought. Someone from the neighboring cubicle even joked "Hey, you seem to have a lot of money" and he said "Yes, I have".
Within 5 minutes or so, everyone seemed settled ... no more voices heard, noises disappeared ... "Back to work" I said to myself and continued to read through the mails in my inbox.
As I was reading through the mails, my manager's manager stopped by my desk and said "Can I see you in my office for a few minutes?" I was surprised at first but nonetheless followed her to her office. We settled into the chairs around the small round table in her office. She started "There has been some changes in our team which might have an impact on you. Today is the last day of your manager in this company". I froze ... didn't I discuss a million things over the past few days with my manager and in none of those discussions was there a hint of his quitting ... didn't he mention even last evening about the slides we needed to include in design sessions to be played early April? Didn't he schedule a meeting only last evening? Was this something he knew about ? Why didn't we have any Knowledge Transfer sessions arranged considering he alone was handling some important stuff? - Many other questions buzzed in my head within a fraction of a second.
My manager's manager continued "I would like you to take on all his responsibilities until we find a suitable replacement". I nodded ... language/words chose to abandon me ... I couldn't speak ... "I'll set aside 1 on 1 time with you on monday to discuss specifics" I mumbled and walked out of her office.
I HAD to talk to my manager to understand what had transpired between last evening and this morning. I went straight to his cube ... but he had left. I hoped to talk to him during the day ... but he never showed up again in office.

Today was my first hand experience of seeing someone being laid off. What's more, he was my reporting manager. The experience was quite chilling to say the least.