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Ge et al. reported a peculiar large glitch observed from SGR 1935recently~\citep{2022arXiv221103246G}. % Interestingly, this glitch occurredabout $3.1\pm 2.5~\rm{days}$ before FRB 200428, accompanied by a delayed spinup (DSU) process with a timescale of $8\pm 1~\rm{days}$. % This DSU is thefirst one detected from magnetars unambiguously, previously, DSU has only beendetected from large glitches of the young Crab pulsar. % Strikingly, this DSUeven resulted in torque reversal, i.e., the spin down state of SGR 1935 wasturned into a spin up one within $8\pm 1~\rm{days}$, the first case observedfrom isolated neutron stars as far as we know. % What's more, the averagepositive torque is consistent in value and order of magnitude with thosededuced from DSUs observed from the Crab pulsar. % The coincidences of DSUappearance and consistent positive torque in the Crab pulsar and SGR 1935suggest that, these DSUs have the same physical origin and should be analyzedsimultaneously. % Joint analysis on DSUs from the Crab pulsar and SGR 1935suggests a physical origin independent of (at least not directly dependent on)rotational parameters. % If this new DSU and torque reversal phenomena befurther confirmed and accretion be excluded convincingly, nearly all modelsregarding DSU phenomenon under the framework of vortex motion should bereconsidered, new physics will be required. % We stress that, joint analysis onDSUs from different pulsars with different rotational parameters may providepivotal clue to reveal their physical origin, even neutron star equation ofstate and the triggering mechanism(s) of (galactic) fast radio burstsultimately.

On torque reversal during delayed spin up glitch of SGR 1935+2154