when the sentry is reporting the new to Creon, he didn't obey his duty very well, and also he became more embroiled within the burial of Polyneices. The Sentry seems to be frustrated with Creon's strict, unwavering stance about the burial issue. While he was reporting the new, the languages have clearly shows the fear of Creon's Wrath
'every man of us, accusing the other, we all proved the other man did it, we were ready to take hot iron in our hands, walk through fire, swear by all the gods, it was not I, I do not know who it was, but it was not I!'
in this part, Sentry's language has became more extreme and it has clearly shows that Sentry is in panic, trying to tell the fact that no one knows what has happened.
Ultimately, Sentry may thinks Creon is not a good leader for the state, due to his inflexible and obsession to his edict with any cost always leads to some unnecessary conflict, causing people suffer