There seems to be a double standard in the comments here.
Companies regularly cut short interviews (speaking from personal experience). They've all been polite about it and explain why, usually saying "it's not the right fit". There are some companies that ask between multiple interviews if the candidate is still interested in talking to the next person.
A candidate should be allowed the same ability to "walk out". From the OPs story I got that he cut his interview not during a round but before the next one was to begin (the reason for moving him into another room). Thats the perfect time to do it. The reason the candidate gave is sufficient, he doesn't wish to waste anyone's time. The response of the company in this case is actually arrogant and unprofessional.
That is not a double standard, most people here are just making pragmatic judgements rather than moral ones. Should the power relationship between employee and employer or between VC and portfolio company be perfectly symmetrical? Maybe. Is it? Usually not, though of course that depends on current market conditions.
Companies regularly cut short interviews (speaking from personal experience). They've all been polite about it and explain why, usually saying "it's not the right fit". There are some companies that ask between multiple interviews if the candidate is still interested in talking to the next person.
A candidate should be allowed the same ability to "walk out". From the OPs story I got that he cut his interview not during a round but before the next one was to begin (the reason for moving him into another room). Thats the perfect time to do it. The reason the candidate gave is sufficient, he doesn't wish to waste anyone's time. The response of the company in this case is actually arrogant and unprofessional.