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Structure with the lowest energy observed in the $^{10}$He spectrum populatedin the proton knockout reaction with $^{11}$Li beam has a peak at $1.2-1.5$MeV. This peak is usually interpreted as a resonant $0^+$ ground state of$^{10}$He. Our theoretical calculations indicate that this peak is likely to bea pileup of $1^-$, $0^+$, and $2^+$ excitations with very similar shapes. %Wepredict a very specific nature of the $1^-$ excitation in $^{10}$He. Moreover,the ``soft'' $1^-$ excitation appears to be the lowest one in energy. Such ananomalous continuum response is traced to the halo structure of $^{11}$Liproviding extreme low energy shift to all the expected continuum excitations.Competitions of the initial state structure (ISS) and the final stateinteraction (FSI) effects on the spectrum and three-body correlations in$^{10}$He are discussed. Analogous effect of the extreme low-energy shift couldalso be expected in other cases of $2n$ emitters populated in reactions withhalo nuclei. Simplified example of the $^{10}$He spectrum in $\alpha$ knockoutfrom $^{14}$Be, is given. We also discuss limits on the properties of $^{9}$Hestemming from the observed $^{10}$He spectrum.

Anomalous population of $^{10}$He states in reactions with $^{11}$Li