Provoke chance and animation (fixes #1132)

* The Provoke chance is now 70% + 3%*skill_lv + srcBaseLevel% - tarBaseLevel%
* When Provoke fails, it will no longer make the caster display any animation

src/map/skill.c

@@ -6631,16 +6631,15 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, ui
 			map_freeblock_unlock();
 			return 1;
 		}
-		//TODO: How much does base level affects? Dummy value of 1% per level difference used. [Skotlex]
-		clif_skill_nodamage(src,bl,skill_id == SM_SELFPROVOKE ? SM_PROVOKE : skill_id,skill_lv,
-			(i = sc_start(src,bl,type, skill_id == SM_SELFPROVOKE ? 100:( 50 + 3*skill_lv + status_get_lv(src) - status_get_lv(bl)), skill_lv, skill_get_time(skill_id,skill_lv))));
-		if( !i )
+		// Official chance is 70% + 3%*skill_lv + srcBaseLevel% - tarBaseLevel%
+		if(!(i = sc_start(src, bl, type, skill_id == SM_SELFPROVOKE ? 100 : (70 + 3 * skill_lv + status_get_lv(src) - status_get_lv(bl)), skill_lv, skill_get_time(skill_id, skill_lv))))
 		{
 			if( sd )
 				clif_skill_fail(sd,skill_id,USESKILL_FAIL_LEVEL,0);
 			map_freeblock_unlock();
 			return 0;
 		}
+		clif_skill_nodamage(src, bl, skill_id == SM_SELFPROVOKE ? SM_PROVOKE : skill_id, skill_lv, i);
 		unit_skillcastcancel(bl, 2);
 
 		if( tsc && tsc->count )