It wasn't that Owen was angry with Jack. He didn't have anything to be angry about. Had the two of them met with Owen being on the arriving end of the spectrum, well...the situation would have gone down a bit differently and with a lot more fists flying. As it were, Owen kept his temper and kept the dirty looks in Jack's direction less frequent.
He rested his forearms on the back of a chair and glanced curiously in Tonks's direction. "So are you one of them magic types? Magic wand an making rabbits disappear and reappear suspiciously? Never really got the point of that. Who cares about bloody rabbits." Ianto's reference was not lost on him, and he turned a wicked grin in his direction, adding a quick "'cept for the "Killer" kind." Oh, British humor.