They laid hold (epilabomenoi). Second aorist middle participle of the common verb epilambanō. The soldiers had no scruples about taking hold of any one of themselves (middle voice). Mar 15:21; Mat 27:32 use the technical word for this process aggareuō, which see note for discussion and also about Cyrene.
Laid on him (epethēkan). K first aorist of epitithēmi.
To bear it (pherein). Present infinitive, to go on bearing.