The German boss admitted defeat as the home side suffered a night to forget with Guardiola's men running riot, while Sanchez and Busquets expressed joy with their dominant display
The 47-year-old believes Leverkusen were not clinical enough as they watched the Catalan giants take full control in the first half, but feels his men gave a better account of themselves in the second period.
"Our defence was very good in the first half, but we showed them too much respect and didn’t move enough,” said Dutt to reporters.
“In the second half it was a completely different story. During the break I asked my players whether they wanted to participate or whether they wanted be the audience.
“In the second half we caused Barcelona some real problems."
Meanwhile, Barcelona striker Alexis Sanchez scored twice to propel the current European champions within reach of the quarter-finals, and claims his second strike was vital to ensure the lead.
However, the Chilean predicts a difficult return leg at Camp Nou, despite Leverkusen defender Vedran Corluka dubbing the tie over.
"Our second goal was really important and we managed to seal the game with a third,” Sanchez told reporters.
“We have started the tie in the right way, but we still have the home leg to play and we will not be relaxing."
Midfield anchor Sergio Busquets revealed the win gave his side a much needed confidence boost following a disappointing result against Ossuana last weekend.
"This result will give us a lot of confidence. We'll be looking for another victory at home now to finish the tie off," the 23-year-old said.
"We had to get over the disappointment of that first half against Osasuna last Saturday and we've started to do that with a good performance here tonight."