I do not wish to speculate on the individual circumstances of this case, as obviously I don't know exactly what happened, which is critical to establishing whether an offence was committed. However, is proffering something in lieu of a valid ticket in the mistaken belief that this is acceptable, rather than asking to purchase a ticket, considered an attempt to avoid payment? If so, it is understandable that the ticket inspector treated it as a ticket irregularity and acted as he did. It seems unwise to expect to be able to pick up pre-paid tickets at a station immediately before starting one's journey, rather than collecting them in advance of travel.