This could have ended much, much worse.

Another angle:

You can't easily tell it from the footage, but the trees fell due to high wind at the tournament:

High winds toppled three massive trees at the Masters on Friday, forcing the tournament officials to halt second-round play and evacuate the grounds. ...

Wind gusts of 26 mph were moving through Augusta around the time the trees fell.

Holy moly, golf isn't supposed to be this dangerous. Thank goodness nobody was hurt or worse!