You can tell that Holl is really fighting it of late due to the fact that he's playing without a lot of confidence. Some games, he appears to be on auto-pilot and just going through the motions of what he thinks a defenseman should do, often looking completely lost. Last night, he even cross-checked a teammate who was helping out in the defensive zone.
I know that Holl is popular among his teammates in the locker room, so I sincerely doubt that this cross-check had anything to do with being frustrated with Malgin. This appears to be more of a situation where Holl is trying to do too much and may have even been at the end of a long shift, exhausted, as Jordie Benn had been on for a minute and 16 seconds at that point during the game. Perhaps he and Holl were stuck out there together for a lengthy one and he was just out of gas and trying to clear the front of the net by any means necessary.