It seems like Barn takes no responsibility for Julia’s injections going wrong. I know that it’s my interpretation of his position, but it still annoys the hell out of me.
It's not just you - back in the '67 eps Barn said as much in as many words that the failure of the experiment was entirely Julia's fault. But as DarkLady so rightly points out, the failure was entirely Barnabas' fault because, over Julia's strenuous objections, he forced her to speed up the experiment. But then none of us should be at all surprised by Barnabas' attitude because all too often he has his own, shall we say, unique take one how events took place.
Particularly whenever Julia and/or Willie are involved.