How does Pliny the Younger make the account of his Uncle's death interesting in lines 13-24?

Pliny uses the chiasmus of ‘festinat illus unde alii fugiunt’ which translates as 'he hurried to that place from which others were fleeing'. The sentence is almost comical, describing how Pliny the Elder is going in the opposite direction, and the chiasmus is used to emphasise the verbs which highlight his uncle’s heroism.