This video was hosted on Vidme, which is no longer in operation. However, you might find this video at one of these links:
Prowl iOS App - 10-second redirect delay
November 11 2014
Starting way back in iOS 6 or 7, I started encountering 10 second delays between swiping a Prowl notification and the actual redirection completing. This video should show quite well how Prowl locks up for about 10 seconds prior to redirect.