Suddenly, the jockey saw a break in the pack. this was his chance. he leaned forward, and his horse surged ahead. during which stage of plot would you expect to read this passage?

The above passage could be read in the third stage of the plot i.e., Climax. Climax depicts the turning point in the story which was not expected.

When Jack saw a break in the pack he surged his horse ahead and grasped the opportunity. When he rushed ahead this creates suspense under the reader as to what might happen now? would he win or not?

with whom will you be coming to the party? this is written correctly.