Flop Analysis
Flop 8c 4s 4h, we hit top pair on a paired board vs a limp/check. With SPR<1, this is a clear get-it-in spot: SB has plenty of worse 8x, 4x, random overcards and floats. Betting 0.4BB works, but practically we don't need sizing complexity here – ripping the full 1.4BB on the flop is simpler and pressures all his random holdings.
Note: With top pair and SPR<1, betting small instead of jamming leaves unnecessary chips behind; shoving flop is cleaner and slightly higher EV.