If Tottenham Hotspur's Champions League win over CSKA Moscow reinforced the feeling their opening-night disappointment against Monaco was an uncharacteristic blip, this 0-0 draw with Bayer Leverkusen offered what may prove a timely reminder.
Europe's premier competition can be tough, at times unforgiving.
For 45 minutes, Spurs looked the superior side to Leverkusen. After the interval, they were fortunate to hang on and earn the point that keeps them second in Group E, sandwiched in second place between Monaco and their latest opponents with a point either way.