Yes, he's perfectly safe. On his way right now for some festivities at the Queen Of Freedom Monument.
7 seconds sound clip from Batman (1966) - When the Rat's Away the Mice Will Play (S1E12) TV Series.
You can hear this line at 00:08:05 in the Blu-ray version of the movie.
Quote context
[...]
- Yes, commissioner, we had a nasty turn but we came out of it alright.
- Have you spoken with King Boris?
- He left us in the clutches of death.
- Well, thank the stars that you managed to escape.
- Commissioner, with The Riddler thinking we're out of the way, he might get a bit careless.
- I suggest that you don't tell anyone that we've contacted you.
[...]