A portfolio manager oversees a globally diversified equity portfolio consisting of over 400 distinct securities spanning multiple industries and geographic regions. A constituent security, representing 50 basis points (bps) of the portfolio's total market value, experiences a precipitous 28% decline in price following an unanticipated, firm-specific operational failure. During this period, broader market indices exhibit minimal volatility.

Considering the portfolio's structure and the nature of the event, how would this development *most likely* be characterized in terms of its primary influence on the *portfolio's total risk*?