Yeah i was saying this to Gav as well, not to mention bits of walker going in their noses, mouths etc That part of the story didn't make a lot of sense to me at all. Besides that gaping plot hole I really enjoyed the episode, oddly it was the worst rated one of the season so far though
Spoiler:
...yeah that’s exactly what I was saying to my ‘Mr Gav’ as well last night.....we both felt we must have missed something ...there are lots of times when open wounds have been exposed and would have absorbed etc into the bloods...so why did Negan feel that contaminating Lucille would infiltrate...on the whole though...and yeah ignoring that huge confusion...I do think it’s getting back more to what was in earlier seasons and becoming generally more interesting again....