What’s up with this hammer coral?

[Bugzyboy41]

I’ve had this coral for a month or two. Was doing great until a snail walked over it and bumped it upside down. I caught it as it was happening and the polyps were upside down on the rock for no more than 30 seconds. This was a week ago and it still looks rather sad. It is getting low to moderate flow and is in moderate lighting. The coral is the reverse hammer on the left.

Is this normal based on what happened or is there something else going on?

 

[Bugzyboy41]

It has closed even more now