Quote Originally Posted by Peelee View Post
He ends a sentence in a proposition in the second panel with V. Which makes sense Roy doesn't seem to be the sort who cares about non-existent grammar rules.
In panel 2, Roy is having something of an emotional outburst, which he immediately apologizes for. He is in a calmer state of mind in panel 5, thinking more carefully about his words.

Indeed, it is not a grammar rule that prepositions are not things with which one ought to end sentences. It is, however, seen by many as "more formal" to avoid doing so.

I think it is a deliberate bit of characterization.