As I understand the sequence of events....
At 1005: 9 X G3M "Nell" from the Genzan Air Corps attack with bombs the "S" Class destroyer HMS Tenedos which was detached from Force Z.
At 1113: 25 x G3M "Nell" from the Mihoro Air Corps attack both battleships with bombs (9 aircraft had 1 x 500Kg bomb - the remainder carried 2 x 250 Kg). There were 8 x near misses and Repulse was hit on the hangar deck.
At 1140: 16 x "Nell" from the Genzan Group; 8 x "Nell" from the Mihoro Group and 26 x G4M "Betty" from the Kanoya Air Group, all carrying one torpedo attacked force Z. PoW was hit 4 times and sank at 1218. Repulse was hit twice and sank at 1223. Three torpedo aircraft were lost in this final attack (one Nell from Genzan and two Bettys from Kanoya).
Force Z's escort of 10 x Brewster Buffalos from 453 Sqn RAAF arrived on scene at 1318, just in time to witness POW sink.