The phrase "after that reassuring" is not correct as it stands and lacks clarity in written English.
It could be used in a context where you are referring to something that follows a reassuring statement or action, but it needs additional context to be meaningful.
Example: "She gave me a smile, and after that reassuring gesture, I felt more at ease."
Alternatives: "following that comforting" or "subsequent to that encouraging".
But they ultimately agreed to the Republican plan after gaining concessions that reassured them the five-year deadline would be achievable.
After that I reassured her that she had handled the call to the best of her ability.
"After that, it is reassuring to know that if your performances are right, you do not need bad results from somebody else.
But Mr Hague was careful to add that the Conservatives were backing the government only after being reassured that it had weighed the risks and would not commit troops to an open-ended ground war.
The next morning, after reassuring Jess that the Brodies aren't a family that condones criminal activity just because they're in politics, Brody decides to drive Dana to the precinct.
I wondered if the teacher had ever actually read the Harry Potter series but anyway, after reassuring her that despite the kid's love of writing stories that end in grisly deaths, she is perfectly normal, we parted ways.
After feeling reassured that we would not be judgmental, some young women explained that motherhood is an esteemed state for many teenagers, particularly for those who come from a more 'traditional' and less urbanised background.
Moazzam Begg, who was released from US custody without charge in 2005, confirmed that the British detainees agreed to drop their legal claims against the Government only after being reassured that Britain would do everything in its power to return Mr Aamer to the UK.
After reassuring us that the river is only eight feet deep, our captain-cum-tour guide took us downriver past fanciful riverside cottages, including one shaped like a windmill and another like a beehive.
Every other month Edwidge's father mailed a half-page, three-paragraph letter addressed to her uncle — "the first paragraph offering news of his and my mother's health, the second detailing how to spend the money they had wired for food, lodging and school expenses for Bob and myself, the third section concluding abruptly after reassuring us that we'd be hearing again from him before long".
