T'Challa climbs on his body very fast and stab his brain with his energy blades, Pym fall unconscious.
Giant Man is good as a meat shield, and against low and mid level enemies, but usually he isn't that useful in the Avengers roster.Atlas punked him when the T-Bolts fought them in their first "meeting".There's place for only one big guy, and Pym isn't that one.