We have investigated the photodetachment of FNH3¯ using slow photoelectron velocity-map imaging spectroscopy and reduced-dimensional quantum dynamical simulations on a global ab initio PES. The cryo-SEVI spectra display a wealth of structure originating from various metastable quantum states. These resonances are reproduced by theory, which allows for their unambiguous assignment in most cases. In particular, the lower-eBE features arise from Feshbach resonances in the PC complex with increasing HF vibrational excitation, coupled with excitation of soft modes such as the HF-NH2 translational mode, the pseudo-rotation of HF, and/or the torsional modes of NH2. While higher-eBE features also exhibit significant HF vibrational excitation, some exhibit significant population in the RC well with possible excitation in the pseudo rotation mode of the NH3 moiety. These TS resonances straddling both sides of the saddle point can impact the bimolecular F + NH3 → HF + NH2 reaction dynamics. Together, this work highlights the ability of cryo-SEVI transition-state-spectroscopy experiments to probe complex dynamical features near the TS and represents a rare glimpse into quantum resonances supported by the PES shaped by the submerged saddle point of a bimolecular reaction.