Well we'll just wait for him to fall over before we rush him. It will be like shooting a turtle!
The point of a hammer is that you don't need to have any two or more people paired together, a hammer is a single unit with the firepower of two or more people. Therefore, if there was an objective that needed to be defended and you were running low on squad support, you could easily leave the hammer to defend one key section of the defense while using the rest of the squad to defend other parts. Let's not even talk about the force multiplier or intimidation factor involved in having one on your team.
Having that much firepower contained by a single unit is a godsend in most battles, it requires far less coordination to release the hellstorm of paint on a location, and in the case that the opfor is far away, the hammer could simply aim up and rain paint on them, hopefully having some breaks or at least make them retreat where the flanking squad could ambush and wipe them. The uses are simply endless. The fact is, having a single unit with two guns is better then two units with two guns, at least in a squad it is.