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Abarzua, N., Pomareda, R., & Vega, O. (2018). Feet in orthogonal-Buekenhout-Metz unitals. Adv. Geom., 18(2), 229–236.
Abstract: Given an orthogonal-Buekenhout-Metz unital U-alpha,U-beta, embedded in PG(2, q(2)), and a point P is not an element of U-alpha,U-beta, we study the set tau(p)(U-alpha,U-beta) of feet of P in U-alpha,U-beta. We characterize geometrically each of these sets as either q + 1 collinear points or as q + 1 points partitioned into two arcs. Other results about the geometry of these sets are also given.