well i spent some time editing the src and i got a very similar result, for the interested people this is the modifications
skill.c
Lines:
3674-3716
case NJ_ISSEN: case MO_EXTREMITYFIST: { short x, y, i = 2; // Move 2 cells for Issen(from target) struct block_list *mbl = bl; short dir = 0; skill->attack(BF_WEAPON,src,src,bl,skill_id,skill_lv,tick,flag); if( skill_id == MO_EXTREMITYFIST ) { mbl = src; i = 1; // for Asura(from caster) status->set_sp(src, 0, 0); status_change_end(src, SC_EXPLOSIONSPIRITS, INVALID_TIMER); status_change_end(src, SC_BLADESTOP, INVALID_TIMER);#ifdef RENEWAL sc_start(src, src,SC_EXTREMITYFIST2,100,skill_lv,skill->get_time(skill_id,skill_lv));#endif // RENEWAL } else { status_change_end(src, SC_NJ_NEN, INVALID_TIMER); status_change_end(src, SC_HIDING, INVALID_TIMER);#ifdef RENEWAL status->set_hp(src, max(status_get_max_hp(src)/100, 1), 0);#else // not RENEWAL status->set_hp(src, 1, 0);#endif // RENEWAL } dir = map->calc_dir(src,bl->x,bl->y); if( dir > 0 && dir < 0) x = -i; else if( dir > 4 ) x = i; else x = 0; if( dir > 2 && dir < 6 ) y = -i; else if( dir == 7 || dir < 2 ) y = i; else y = 0; if( (mbl == src || (!map_flag_gvg2(src->m) && !map->list[src->m].flag.battleground) ) // only NJ_ISSEN don't have slide effect in GVG && unit->movepos(src, mbl->x+x, mbl->y+y, 0, 0) ) { //clif->slide(src, src->x, src->y); clif->fixpos(src); clif->spiritball(src); } } break;
here is a video of the result
https://www.youtube.com/watch?v=b3UDFDf5oOs