Final answer:
Bruno's reaction to practicing his racing technique is one of newfound confidence, and he feels ready to challenge the fastest penguins in his colony.
Step-by-step explanation:
The excerpt from Bruno and the Race does not explicitly tell us the outcome of the race or Bruno's reaction to practicing his racing technique in terms of winning or losing. However, it does indicate that Bruno has been practicing his racing technique every evening and is ready to show the penguin colony his newfound confidence.
This suggests that he has been improving and feels prepared to challenge the fastest penguins, despite others doubting his abilities.
Bruno's reaction to practicing his racing technique is that he feels confident and ready to show the colony his newfound skills. In the excerpt, it is mentioned that Bruno has been practicing his racing technique every evening and he is determined to challenge Jeanette and Trevor, the fastest penguins in the colony.
This shows that Bruno believes in himself and is willing to prove everyone wrong.