No sir, I meant line 4. There aren't any exemptions for line 4 besides the short haul exemption, which doesn't apply here. True, you can be on line 4 24/7/365 and not violate anything, but you'll get the line 4 violation if you drive before taking the proper break.
Line 3 violation just means you drove more than 11 hrs without a break. Drive for 7 hrs, stop for 7 hours, you'll get a line 4 violation when you drive.
Your on duty driving and 14 hr clocks are two separate clocks that aren't integrated. Even when you're on lines 1 or 2, that 14 hour clock will still tick until you log enough time for a proper break.