My theory is, because Saul is such a badass, he could simply set eyes upon a woman and get her pregnant. As soon as I heard his voice, I swear I started getting Braxton Hicks symptoms :D
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That made me laugh.
Quick question for those with better knowledge of the timeline:
Did Saul and Lizzy hook up before or after Saul was shot and possibly got infected with the zombie blood bullet?
Aw crap I thought the hybrid Zed baby would ensure Zombies survive in a new way. :P
That's rather weird, but yea it was before he got injured.