"It was very good bowling from Mitchell Starc but it was the whole euphoria around us and the packed park that probably gave the batsmen those nerves."
What pleased Sinclair was Kane Williamson and Corey Anderson stepping up, although the latter struggled earlier on.
Despite the skin-of-the-teeth scenario, he felt it was a timely yardstick to measure the players' character and resolve.
New Zealand, Australia, South Africa and India will be the last four when the dust settles.
"Gauging between India and Sri Lanka at the moment it'll be great if we can face Sri Lanka because we've had it over them."
While India have a batting line up that is among the elite Sinclair feels Kiwi batsmen also can give the defending champions' bowlers some decent stick.
However, he hastened to add even England could force their way into the semifinals "and that's going to be a disastrous result".