Mov Speed to the Caster

[Vyserion]

Hello community!

  I have a question, since I just spent a couple of hours solving it but no success.

Based on this skill src, where or how do I make ONLY the caster receive the movement speed bonus instead of the whole party?

sc_start(src,bl,SC_SPEEDUP1,100,30,3000);

	case PR_MAGNIFICAT:
		if( sd == NULL || sd->status.party_id == 0 || (flag & 1) )
			clif_skill_nodamage(bl, bl, skill_id, skill_lv, sc_start(src,bl,type,100,skill_lv,skill_get_time(skill_id,skill_lv)));
		else if( sd )
			party_foreachsamemap(skill_area_sub, sd, skill_get_splash(skill_id, skill_lv), src, skill_id, skill_lv, tick, flag|BCT_PARTY|1, skill_castend_nodamage_id);
		break;

Thanks!