The $iShares 20+ Year Treasury Bond ETF(TLT)$ , an indicator for long-term bonds, saw erratic movements on Friday, reflecting uncertainty among bond investors following December's labor market report.Initially, the $iShares 20+ Year Treasury Bond ETF(TLT)$ fell more than 1.0%, but rallied 1.5% within an hour, only to fall back into negative territory by midday.The labor market report showed 216,000 new jobs, beating estimates and indicating continued economic growth. However, 71,000 jobs from previous months were also revised downwards, keeping leaving the unemployment rate at 3.7%.Investors who were initially uncertain about the Fed's stance tended to buy, but concerns about a con