I believe it was Bob Ewell
He says that Katniss shoots them right in the eye every time
And he buys them from her
The pun is, "Santa arrived at the party just to the NICK of time." He's often referred to as "Saint Nick." The meaning of the pun, is, he made it to the party quick, or he made it just in time.
1.An arch consists of two weaknesses so it's always shake and needs to "stay awaje".