Whakaotihia te rerenga e whai ake nei: I te 2012 Summer Olympics i Rānana, i whakataetae a Halsall i nga kaupapa e rima. I tae a Halsall ki te haurua whakamutunga o te 100m butterfly, i te wa o te 58.52, i te wa o tana wa tino pai o te 57.56 i whakaturia i te marama o Maehe. I eke a Halsall ki te whiringa toa o te 100m kāhua herekore me
50m freestyle, ka mutu i te 6th me te 5th. I roto i te 4 × 100 m freestyle relay Halsall i kaukau i te waewae tuarua i roto i te wehenga o te 53.29, ka awhina i te roopu o Ingarangi ki te whakaoti i te 5 o nga waahi. I te whakamutunga o te 4 × 100 m medley relay i mutu te kapa o Ingarangi i te 8th, me Halsall e whakarato ana i te waewae pungawerewere o 54.08.