  More evidences have now been collected at the Large Hadron Collider
suggesting the new 125 - 126 GeV boson is likely the long sought Higgs boson in
the standard model. One pressing question continued being asked by theorists is
whether this Higgs boson is a lone player responsible for the full electroweak
symmetry breaking. Current data still allow room for additional Higgs bosons or
some other UV physics that may play a partial role in electroweak symmetry
breaking as well. We use the WW scattering to investigate such a possibility,
using the two-Higgs-doublet model as a prototype. The WW scattering becomes
strong when the extra Higgs bosons are very heavy. We study the sensitivity of
the partially strong WW scattering signals at the 13 TeV Large Hadron Collider.
