Arm interview questions

There was first HireView round then coding test round and the then I was offered a final interview. The Final interview was very weird for me but as a good match to the job the interview went smooth. The interviewer was very polite and then we went ahead and did bug solving in C++. Some question I answered were promptly but there was one which I didn't know and I got stuck. It was about if you use a new word in C++ to make a variable and assign it a memory location what can go wrong in this. I said we might be out of memory and compiler wont be able to assign a variable space in this context. The interviewer didn't seem satisfied with my answer, and we were stuck on this for 5 mins. At the end interviewer said that you should not use new for this type of situation (that wasn't the question) but ok fair enough but the question wasn't communicated properly and in the end the interviewer just said something which didn't make sense. Other than that the interview was pretty good for me and even though we were stuck at this one question for 5 mins everything else other than this awkward interaction was pretty good.