Assemble your pen banger and fire it overhead or unholster and aim your bear spray to stop this. You've got about three seconds.
I suppose the odds are in my favour thus far, in 101 days in da bush in the past 7 Summers we have only seen a bear once.
Reading up a little Wikipedia on black bears.. there are some bruisers in the East. New Jersey does have 800 lb bears though most are much smaller ( the ones I have seen or my husband has hit) Western bears (except for the PNW) tend to be smaller.
Not sure why that would be except maybe that grizzlies are better adapted to those areas and either are competing for food with blacks, or that the smaller blacks are better at staying out of the grizzly's way.