Under any circumstances DO NOT attempt to remove the Scout from the iOS Bluetooth device list to resolve the connection. This will break the bonded/encrypted connection to the Scout.
Firstly, try a force close of the Knog app, by bringing the app to center screen, then swipe up to close it. Reopening the Knog app should establish the connection back with your Scout, where you can now dis-arm.
Firmware updates to further stabilize the Knog app are in progress but should your app be increasingly unresponsive or unreliable please get in touch and we can investigate.