Since the flow of time inside the Inn and the Abaddon realm was so different, a simple, quick interaction at the Inn could last hours or possibly even days within Abaddon - unless they found a place to equalize the flow of time.
Since they couldn't really move, Lex had to just tolerate the excruciating wait while chatting with Kaemon and healing everyone around him.
Healing mortals was easy - it would only take him minutes. But unless he planned on using his own blood's healing ability, which he absolutely did not plan on using unless it was a life or death situation, even his best healing would only bring the recovery down to several months.
That was the extent to which the entire Reaving Dread had been injured. In fact, this was the worst they had ever suffered their entire time within Abaddon.
In moments like this, the Midnight Tavern really proved just how incredibly valuable it was. Who else could provide such incredible service on the go?