Magic Defense Up routine

0018631c: 3c028019 lui r2,0x8019		
00186320: 8c422d98 lw r2,0x2d98(r2)		Load Defender's Stats
00186324: 00000000 nop				
00186328: 90420090 lbu r2,0x0090(r2)		Defender's 2nd set of Supports
0018632c: 00000000 nop				
00186330: 30420002 andi r2,r2,0x0002		
00186334: 1040000b beq r2,r0,0x00186364		Branch if the Defender doesn't have Defense Up
00186338: 3c025555 lui r2,0x5555		
0018633c: 3c048019 lui r4,0x8019		
00186340: 248438ce addiu r4,r4,0x38ce		Load XA
00186344: 84830000 lh r3,0x0000(r4)		
00186348: 34425556 ori r2,r2,0x5556		R2 = 55555556 or 1/3 when used in multiplication 
0018634c: 00031840 sll r3,r3,0x01		XA * 2
00186350: 00620018 mult r3,r2			XA * 2 / 3
00186354: 00031fc3 sra r3,r3,0x1f		
00186358: 00001010 mfhi r2			Move "Remainder" to r2
0018635c: 00431023 subu r2,r2,r3			
00186360: a4820000 sh r2,0x0000(r4)		Store new XA
00186364: 03e00008 jr r31			
00186368: 00000000 nop