Most of the 2nd half was a perfect storm of a few things that made it total poo-poo.
To their credit, Columbia made a defensive adjustment in the 2nd half to start overplaying our perimeter offense. Rather than attack it with relentless blowby drives and cuts/backdoor cuts, we just kinda stagnated and forced lousy dangerous East-West passes. This happened for a bunch of possessions. Those chastising Ross for "disappearing" in the 2nd half should realize that he, like JStew, is the 4th/5th option for offense. They almost always will not be getting the ball as a 1st/2nd scoring option. Our sets never progressed enough to get Ross good looks.
The refs started calling things tighter, which took away all the game flow of the 1st half.
We got uninspired/complacent on defense for a bunch of possessions. Guys out of place, getting blown by, resulted in a lot of bad positioning/rotating (and fouls). In contrast, our D was swarming in the first half and resulted in a bunch of transition offense.
Some other things too, but you get the idea.
Hurley in his presser said something to the effect that the team fell victim to "human nature" in the second half (getting complacent when there wasn't much to worry about). We all know that there will be game film sessions over the next few days (probably pictures posted in front of urinals too) of things that we can't be doing on Saturday if we want to end up with a winning effort.
Early season, work in progress, but we're making progress. Other Top 20 teams are going through the same things if you watch games, look at box scores, game logs, etc.