Please test. It's just a copy of Ind's INF2_NOLP.
Go to src/map/skill.c:
Find:
if( !(skill_get_inf2(group->skill_id)&(INF2_SONG_DANCE|INF2_TRAP)) && map_getcell(bl->m, bl->x, bl->y, CELL_CHKLANDPROTECTOR) )
Change to:
if( !(skill_get_inf2(group->skill_id)&(INF2_SONG_DANCE|INF2_TRAP|INF2_NOLP)) && map_getcell(bl->m, bl->x, bl->y, CELL_CHKLANDPROTECTOR) )
Go to src/map/skill.h:
Find:
INF2_NO_ENEMY = 0x1000,
Add after:
INF2_NOLP = 0x2000,
Go to db/skill_db.txt:
Find:
516,0,8,4,-1,0x2,3,10,1,no,0,0,0,weapon,0, GS_DESPERADO,Desperado
Change to:
516,0,8,4,-1,0x2,3,10,1,no,0,0x2000,0,weapon,0, GS_DESPERADO,Desperado
Remember to recompile your emulator.
I can't test, ...your emulator is kinda old.