<prompt> Bhala ukuqhubeka kwalesi sigaba - Emidlalweni yama-Olympic asehlobo ka-2012 eLondon, uHalsall waqhudelana emidlalweni emihlanu. UHalsall ufinyelele kuma-semi-finals emidlalweni engu-100m butterfly, efaka isikhathi esingu-58.52, esedlula isikhathi sakhe esihle kakhulu sesizini engu-57.56 asetha ngoMashi. UHalsall wafinyelela kowamanqamu wamamitha angu-100 ngesitayela samahhala nawama-50 ngesitayela samahhala  <response>: , aqede endaweni yesithupha neyesihlanu ngokulandelana. Emncintiswaneni we-freestyle 4×100 m uHalsall wabhukuda umlenze wesibili ngesikhathi esingu-53.29, esiza iqembu laseBrithani ukuba lifinyelele endaweni yesihlanu. Emdlalweni wokugcina we-4 × 100 m medley relay iqembu laseBrithani laqeda ngo-8th, noHalsall enikeza umlenze we-anchor ka-54.08. 