100k traded in 1 5-minute bar. Nope, nothing unusual about

100k traded in 1 5-minute bar. Nope, nothing unusual about that on a day that was low volume until then.

http://bigcharts.marketwatch.com/quickchart/q...&show=

Remember, it's the right-hand pane -- this is a 2-day chart -- and it's a delayed dynamic chart that will keep changing.