Slack lines is the main reason your kite will fall out of the sky. Unfortunately as a newbie you will be concentrating on a million of things and not many of them involve your kite. You've got two options really, worry about your board and untangle your kite or worry about your kite and collect your board later on. Sometimes it seems like a hard choice but forget the board and always keep that kite going. If it's a tough choice cause you've ponied up for a brand new board, go and buy a cheap second hand board that you don't mind losing, put your number on it and someone will give it back out of sympathy.
If you kite in estuaries or the sea only kite an hour each side of the high/low tide while you start out. Trying to recover yourself let alone a board in a ripping spring tide current is no joke.
With the North 5 lines you need to keep them active, don't think it will just sit up there waiting for you. It will either jag around like a spaz seagull or simply fall out of the sky if there is no line pressure. As you start to put more pieces together you will gain better kite control and it will happen less often. Make sure you read the other posts on self recovery in the mean time, it could save your fingers
To answer your actual question though, in some cases yes but unless you're a fair way from the setup area I would just go in and sort it out.
