In a declared buffer zone, after announcing he intended to this, and after an hour or more of refusing to move on.

It was deliberate disregard of a buffer zone that applied to all that had no business within the abortion centre, whether he was praying in his head or not we'll never know and it's immaterial to the reason for the arrest.

Noneheless all he did was stand silently. There is no way it is right to criminalise standing and saying nothing.