Assignment Grid News Today

>> when we clear our assignment grid, were coming back to here. >> reporter: tonight, first responders canvassing houston. the citys bravest checking on the citys residents. >> all were doing is were going by each house, checking door to door. >> reporter: theyve rescued more than 7,000 from the floodwaters, working double shifts, while many of their own homes are flooded. fighting fires in chest-high water. >> we got to go, guys. fire hydrant. >> reporter: going under to connect the hose. >> we...